Module 05: Flashcards
Find sin θ if cot θ = - 2 and cos θ < 0. (2 points)
√5/5
Use basic identities to simplify the expression. (2 points)
cos θ - cos θ sin2θ
- sec2θ
- sin θ
- tan2θ
- cos3θ
3.cos3θ
Use basic identities to simplify the expression. (2 points)
1/cot2θ+ sec θ cos θ
sec2θ
Simplify the expression. (2 points)
(csc2x sec2x)
÷
(sec2 x + csc2x)
- sin2x
- cos2x
- -1
- 1
4. 1
Factor the algebraic expression below in terms of a single trigonometric function.
csc 2x - 1

Find all solutions in the interval [0, 2π).
cos2x + 2 cos x + 1 = 0
x = π
Find all solutions in the interval [0, 2π).
(sin x)(cos x) = 0
0, π/2; π, 3π/2
Find all solutions to the equation.
cos2x + 2 cos x + 1 = 0
cos2x + 2cosx + 1 = 0
(cosx + 1)2 = 0
cosx + 1 = 0
cosx = -1
x = π + 2πn
Find an exact value:
sin(11π/12)
(√6 - √2)/4
Find an exact value:
cos (19π/12)
(√6 - √2)/4
Write the expression as either the sine, cosine, or tangent of a single angle. (2 points)
sin 48° cos 15° - cos 48° sin 15°
- cos 33°
- cos 63°
- sin 63°
- sin 33°
4. sin 33°
Write the expression as either the sine, cosine, or tangent of a single angle:
sin (π/2)cos(π/7) + cos(π/2)sin(π/7)

Find an exact value. (2 points)
cos 15°
√6 +√2
÷
4
Write the expression as either the sine, cosine, or tangent of a single angle. (2 points)
sin 48° cos 15° - cos 48° sin 15°
- cos 33°
- cos 63°
- sin 63°
- sin 33°
4. sin 33°
Find all solutions to the equation in the interval [0, 2π). (3 points)
cos 4x - cos 2x = 0
0, π/3, 2π/3, π, 4π/3, 5π/3
Rewrite with only sin x and cos x. (3 points)
sin 3x
2 cos2x sin x + sin x - 2 sin3x
Find the exact value by using a half-angle identity: sin(7π/8)

.
Find cot θ if csc θ = √17/4 and tan θ > 0.
1/4
Simplify the expression: cot x sin x - sin (π/2 - x) + cos x (1 point)
- cos x
- sin x
- 2 sin x
- 2 cos x
1. cos x
Find tan θ if sec θ = √37/6 and sin θ < 0
-1/6
Find all solutions in the interval [0, 2π). (1 point)
sec2x - 2 = tan2x
No solution
Find all solutions to the equation. (1 point)
sin x = √3/2

Find an exact value: sin (-11π/12)
(√2 - √6)
÷
4
Write the expression as the sine, cosine, or tangent of an angle. (1 point)
sin 9x cos x - cos 9x sin x
- sin 10x
- cos 8x
- sin 8x
- cos 10x
3. sin 8x
Write the expression as the sine, cosine, or tangent of an angle. (1 point)
cos 112° cos 45° + sin 112° sin 45°
- sin 157°
- sin 67°
- cos 157°
- cos 67°
4. cos 67°
Rewrite with only sin x and cos x. (1 point)
sin 2x - cos 2x
2 sinx cosx - 1 + 2 sin2x
Find the exact value by using a half-angle identity. (1 point)
sin 22.5°
1/2 √(2 - √2)
Find all solutions to the equation in the interval [0, 2π). (1 point)
cos x = sin 2x
π/6, π/2, 5π/6, 3π/2
Rewrite with only sin x and cos x. (1 point)
sin 2x - cos x
- 2 sin x cos2x
- sin x
- cos x (2 sin x - 1)
- 2 sin x
3. cos x (2 sin x - 1)
Verify the identity


Find cos θ if sin θ = -12/13 and tan θ > 0
-5/13
Use basic identities to simplify the expression. (6 points)
sin2θ + tan2θ + cos2θ
- sec2θ
- cos3θ
- sin θ
- tan2θ
1. sec2θ
Write the expression as the sine, cosine, or tangent of an angle. (6 points)
sin 5x cos x - cos 5x sin x
- cos 6x
- cos 4x
- sin 6x
- sin 4x
4. sin 4x
Rewrite with only sin x and cos x. (6 points)
sin 2x - cos 2x
- 2 sin2x - 2 sin x cos x + 1
- 2 sin x
- 2 sin2x + 2 sin x cos x - 1
- 2 sin2x - 2 sin x cos x - 1
3. 2 sin2x + 2 sin x cos x - 1
Verify the identity. (7 points)
cos 4u = cos22u - sin22u

Verify the identity.


What are the repicrocal identities?

What are the quotient identities?

What are the Pythagorean identities?

What is the confunction identities?

What is the Even/Odd Identities?

What are the methods for solving trigonometric equations?
Step 01: Solve the equations for the trigonometric value
Step 02: Find all solutions, or general solutions, by adding:
- 2π n to the radians measures for sine and cosine
- πn to radian measures for tangent and cotangent
Step 03: Final all solutions with specific interval by substituting random integers for n.
- Accept: solutions within interval
- Reject: solutions outside interval
Remember, x-coordinates represent cosine values and y-coordinates represent sine values.
What are the sun and different formulas?

What are the Multi-Angle Formulas?

What are the Half-Angle Formulas?

What are the Power Reducing Formula?
