1. Chapter 6 Test Review

2. State the values of θ for which each equation is true:
1.) sin θ = ) sec θ = ) tan θ = 0
270° + 360°k
180° + 360°k
180°k
4.) Sin θ = ) Sec θ = ) Tan θ = 0
180° 0°
-90°

3. State the amplitude, period, and phase shift of each function.
y = -2sin θ y = 10sec θ y = -3sin4θ
y = 2.5cos(θ + 180°)
A = 2
P = 360°
PS = 0°
A = 10
P = 360°
PS = 0°
A = 3
P = 90° or π/2
PS = 0°
A = 0.5
P = 360° or 2π
PS = 60° π/3 RIGHT
A = 2.5
P = 360° or 2π
PS = 180° π LEFT
A = 1.5
P = 90° or π/2
PS = π/16 RIGHT

4. y = ±0.75cos(θ – 30°) y = ±4cos(120θ + 3600°)
Write an equation of the cosine function with amplitude, period, and phase shift given.
1. A = 0.75, P = 360°, PS = 30° 2. A = 4, P = 3°, PS = -30°
y = ±0.75cos(θ – 30°)
y = ±4cos(120θ °)

5. Graph: ° ≤ x ≤ 360°, scale 45°
1. y = 2cos (2x – 45°) y = 2sin x + cos x X
2sinx
Cosx
SUM 1 90 2
180 -1
270 -2
360

6. Find the values of x (0°≤x≤360°) that satisfy each equation.
1. x = arccos 1 2. arccos = x 3. arcsin ½ = x 4. sin-1 (-1) = x 5. sin-1 = x 6. cot-1 1 = x
cos x = 1
0°, 360°
cos x =
45°, 315°
sin x = ½
30°, 150°
sin x = -1
270°
cot x = 1
45°, 225°
sin x =
45°, 135°

7. Evaluate. Assume all angles are in quadrant I
cos (cos-1 ½) sin (cos-1 ½) cos (sin-1 ½) 4.
1/2
√3/2
√3/2
tan (45° - 45°) = tan 0° = 0

8. Evaluate.

9. State the domain and range of each function:
y = Cos x 2. y = Sin x 3. y = Tan x
4. y = Arccos x 5. y = Sin-1 x 6. y = Arctan x
Domain: 0° ≤ x ≤ 180°
Range: -1 ≤ y ≤ 1
Domain: -90° ≤ x ≤ 90°
Range: -1 ≤ y ≤ 1
Domain: -90° < x < 90°
Range: all reals
Domain: -1 ≤ x ≤ 1
Range: 0° ≤ y ≤ 180°
Domain: -1 ≤ x ≤ 1
Range: -90° ≤ y ≤ 90°
Domain: all reals
Range: -90° < y < 90°

10. Graph y = Arccos x

11. Graph y = Arcsin x

12. Graph the inverse of: y = Sin (x + 90°)

13. Graph the inverse of: y = Arctan x + π/4

14. Determine a counterexample for the following statement:
1. Cos-1 x = Cos-1 (-x) Sin-1 x = -Sin-1 x
x = 1
x = 1
x = π/2 or 90°
x = 0°

15. Find the inverse of each function:
1.) y = Cos (x + π) 2.) y = Sin x 3.) y = Sin θ + π/2 4.) y = Sin (x + π/2)

16. Determine a value for x that would NOT produce a counterexample to the equation:

17. Write an equation with a phase shift 0 to represent a simple harmonic motion under each set of circumstances.
1.) Initial pos. 12, amplitude 12, period 8 2.) Initial pos. 0, amplitude 2, period 8π 3.) Initial pos. -24, amplitude 24, period 6

18. The paddle wheel of a boat measures 16 feet in diameter and is revolving at a rate of 20 rpm. If the lowest point of the wheel is 1 foot under water, write an equation in terms of cosine to describe the height of the initial point after “t” seconds.

19. State the amplitude, period, frequency, and phase shift for the function:
PS =

20. Write an equation with phase shift 0 to represent simple harmonic motion with initial position 0, amplitude 5, and period 3
Initial position 0 means it is a sine function.
Period = 2π / k = 3
k = 2π/3

21. Write an equation with phase shift 0 to represent simple harmonic motion with initial position -12, amplitude 12, and period ½
Initial position -12 means it is a cosine function.
Period = 2π / k = ½
k = 4π

22. The paddle wheel of a boat measures 16 feet in diameter and is revolving at a rate of
20 rpm. If the lowest point of the wheel is 1 foot under water, write an equation
in terms of cosine to describe the height of the initial point after t seconds.

23. Evaluate. 1/2 √3 tan (120° + 60°) = cos 180° = -1
sin (Sin-1 ½) tan (Arccos ½) Cos (tan π/4) 4.
1/2 √3
tan (120° + 60°) = cos 180° = -1