5.4 Solve Trigonometric Equations
Chapter
Chapter 5
Section
5.4
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Lectures 12 Videos

Introduction to Solving Trig Equation with a linear equation with Trig example

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3.01mins
Introduction to Solving Trig Equation with a linear equation with Trig example

Trig Equation in Quadratic Equation Form Differences of Squares

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2.28mins
Trig Equation in Quadratic Equation Form Differences of Squares

When the solution to Trig equation is not a special angle

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1.47mins
When the solution to Trig equation is not a special angle

Solving Trig Equation in ax^2+bx+c=0 form

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2.01mins
Solving Trig Equation in ax^2+bx+c=0 form

Solving Trig Equation by Converting to Quadratic Equation form using Trig Identity

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2.09mins
Solving Trig Equation by Converting to Quadratic Equation form using Trig Identity

Trig Equation with csc ratio and in Quadratic Form

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1.44mins
Trig Equation with csc ratio and in Quadratic Form

Solving Trig Equation by simplifying it first using Double Angle Formula

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2.48mins
Solving Trig Equation by simplifying it first using Double Angle Formula

Solving Trig Equation advanced example with sum of power of 6 of sin and cosine

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3.28mins
Solving Trig Equation advanced example with sum of power of 6 of sin and cosine

Solving Trig Formula that requires simplification using Compounded Angle Formula

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2.42mins
Solving Trig Formula that requires simplification using Compounded Angle Formula

Solving Trig Equation in the form of A\sin x + B\cos x = C

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2.48mins
Solving Trig Equation in the form of Asinx + Bsinx = C
Solutions 44 Videos

Determine approximate solutions for each equation in the interval x\in [0, 2\pi] to the nearest hundredth of a radian.

 \displaystyle \sin x -\frac{1}{4} = 0 

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0.54mins
Q1a

Determine approximate solutions for each equation in the interval x\in [0, 2\pi] to the nearest hundredth of a radian.

 \displaystyle \cos x +\frac{3}{4} = 0 

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1.40mins
Q1b

Determine approximate solutions for each equation in the interval x\in [0, 2\pi] to the nearest hundredth of a radian.

 \displaystyle \tan x - 5= 0 

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0.50mins
Q1c

Determine approximate solutions for each equation in the interval x\in [0, 2\pi] to the nearest hundredth of a radian.

 \displaystyle \sec x - 4= 0 

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1.01mins
Q1d

Determine approximate solutions for each equation in the interval x\in [0, 2\pi] to the nearest hundredth of a radian.

 \displaystyle 3\cot x + 2= 0 

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1.33mins
Q1e

Determine approximate solutions for each equation in the interval x\in [0, 2\pi] to the nearest hundredth of a radian.

 \displaystyle 2\csc x + 5= 0 

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1.37mins
Q1f

Determine exact solutions for each equation in the interval x\in [0, 2\pi].

 \displaystyle \sin x + \frac{\sqrt{3}}{2} = 0 

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1.12mins
Q3a

Determine exact solutions for each equation in the interval x\in [0, 2\pi].

 \displaystyle \cos x - 0.5 = 0 

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0.40mins
Q3b

Determine exact solutions for each equation in the interval x\in [0, 2\pi].

 \displaystyle \tan x - 1= 0 

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0.36mins
Q3c

Determine exact solutions for each equation in the interval x\in [0, 2\pi].

 \displaystyle \cot x + 1= 0 

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1.07mins
Q3d

Determine approximate solutions for each equation in the interval x\in [0, 2\pi], to the nearest hundredth of a radian.

\sin^2x -0.64 = 0

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1.23mins
Q5a

Determine approximate solutions for each equation in the interval x\in [0, 2\pi], to the nearest hundredth of a radian.

\cos^2x -\frac{4}{9} = 0

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1.27mins
Q5b

Determine approximate solutions for each equation in the interval x\in [0, 2\pi], to the nearest hundredth of a radian.

\tan^2x -1.44 = 0

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1.34mins
Q5c

Determine approximate solutions for each equation in the interval x\in [0, 2\pi], to the nearest hundredth of a radian.

\sec^2x -2.5 = 0

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1.59mins
Q5d

Determine approximate solutions for each equation in the interval x\in [0, 2\pi], to the nearest hundredth of a radian.

\cot^2x -1.21 = 0

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1.47mins
Q5e

Determine exact solutions for each equation in the interval x\in [0, 2\pi].

 \displaystyle \sin^2x - \frac{1}{4} = 0 

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1.02mins
Q7a

Determine exact solutions for each equation in the interval x\in [0, 2\pi].

 \displaystyle \cos^2x - \frac{3}{4} = 0 

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1.30mins
Q7b

Determine exact solutions for each equation in the interval x\in [0, 2\pi].

 \displaystyle \tan^2x - 3 = 0 

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1.26mins
Q7c

Determine exact solutions for each equation in the interval x\in [0, 2\pi].

 \displaystyle 3\csc^2x - 4 = 0 

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1.42mins
Q7d

Solve \sin^2x - 2\sin x - 3 =0 on the interval x\in [0, 2\pi].

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0.57mins
Q9

Solve \csc^2x - \csc x - 2 =0 on the interval x\in [0, 2\pi].

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1.15mins
Q10

Solve 2\sec^2x + \sec x - 1 =0 on the interval x\in [0, 2\pi].

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1.14mins
Q11

Solve \tan^2x + \tan x - 6 =0 on the interval x\in [0, 2\pi]. Round answers to the nearest hundredth o a radian.

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2.24mins
Q12

Determine approximate solutions for each equation in the interval 2x \in [0, \pi], to the nearest hundredth of a radian.

\sin 2x - 0.8 = 0

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1.07mins
Q13a

Determine approximate solutions for each equation in the interval 2x \in [0, \pi], to the nearest hundredth of a radian.

5\sin 2x - 3 = 0

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1.05mins
Q13b

Determine approximate solutions for each equation in the interval 2x \in [0, \pi], to the nearest hundredth of a radian.

-4\sin 2x + 3 = 0

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0.58mins
Q13c

Solve 2\tan^2x + 1 = 0 on the interval x\in [0, 2\pi].

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0.41mins
Q14

Solve 3\sin 2x - 1 = 0 on the interval x\in [0, 2\pi].

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1.49mins
Q15

Solve 6\cos^2x - 5\cos x - 6 = 0 on the interval x\in [0, 2\pi].

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2.03mins
Q16

Solve 3\csc^2x - 5\csc x -2 = 0 on the interval x\in [0, 2\pi].

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1.16mins
Q17

Solve \sec^2x + 5\sec x + 6 = 0 on the interval x\in [0, 2\pi].

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2.34mins
Q18

Solve 2\tan^2x - 5\sec x -3 = 0 on the interval x\in [0, 2\pi].

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2.18mins
Q19

Consider the trigonometric equation 3\sin^2x + \sin x - 1 = 0.

• Explain why the left side of the equation cannot be factored.
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0.59mins
Q20a

Consider the trigonometric equation 3\sin^2x + \sin x - 1 = 0.

Use the quadratic formula to obtain the roots.

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0.36mins
Q20b

Consider the trigonometric equation 3\sin^2x + \sin x - 1 = 0.

Determine all solutions in the interval x \in [0, 2\pi].

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1.29mins
Q20c

The height, h, in metres, above the ground of a rider on a Ferris wheel can be modelled by the equation h = 10\sin(\frac{\pi}{12}(t - 7.5)) + 12, where t is the time, in seconds.

At t = 0 s, the rider is at the lowest point. Determine the first two times that the rider is 20 m above the ground, to the nearest hundredth of a second.

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3.20mins
Q22

Consider the trigonometric equation 4\sin x \cos 2x + 4\cos x \sin 2x - 1 = 0 in there interval x \in [0, 2\pi]. Either show that there is no solution to the equation in this domain, or determine the smallest possible solution.

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6.15mins
Q23

Consider the equation 2\cos^2x + \sin x - 1= 0.

Explain why the equation cannot be factored.

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0.18mins
Q25a

Consider the equation 2\cos^2x + \sin x - 1= 0.

Suggest a trigonometric identity that can be used to factor.

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0.50mins
Q25b

Consider the equation 2\cos^2x + \sin x - 1= 0.

i) Apply the identity and rearrange the equation into a factorable form.

ii) Factor the equation.

iii) Determine all solutions in the interval x \in [0, 2\pi].

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1.01mins
Q25cdef

Determine solutions for \tan x \cos^2x -\tan x = 0 in the interval x \in [-2\pi, 2\pi].

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2.03mins
Q26

The voltage, V, in volts, applied to an electric circuit can be modelled by the equation V = 167 \sin(120\pi t), where t is the time, in seconds. A component in the circuit can be safely withstand a voltage of more than 120 V for 0.01 s or less.

Determine the length of time that the voltage is greater than 120 V on each half-cycle.

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2.45mins
Q27a

The voltage, V, in volts, applied to an electric circuit can be modelled by the equation V = 167 \sin(120\pi t), where t is the time, in seconds. A component in the circuit can be safely withstand a voltage of more than120 V for 0.01 s or less.

Is it safe to sue this component in this circuit? Just icy your answer.

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0.25mins
Q27b

Determine solutions for

 \displaystyle \frac{\cos x}{1 +\sin x} + \frac{1 + \sin x}{\cos x} = 2 

in the interval x \in [-2\pi, 2\pi].

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2.27mins
Q28