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College Math Practice Test 25

# Sine Cosine Tangent Quiz Questions and Answers PDF - 25

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The Quiz: 2sin(x+45°)sin(x-45°) =; "Sine Cosine Tangent" App Download (Free) with answers: −cos2x; Cos2x; Sin2x; −sin2x; for online college classes. Learn Trigonometric Identities Questions and Answers, Apple eBook to download free sample to learn e-learning courses.

## Sine Cosine Tangent Questions and Answers : Quiz 25

MCQ 121:

2sin(x+45°)sin(x-45°) =

1. cos2x
2. −cos2x
3. sin2x
4. −sin2x
MCQ 122:

Cos(α + β)cos(α - β) =

1. cos²α-sin²β
2. sin²α-cos²β
3. 2cosα
4. 2sinα
MCQ 123:

Partial fractions of 1/(x²-1) are equivalent to

1. Ax+B/(x²-1)
2. A/(x+1) + B/(x-1)
3. A/(x+1)
4. B/(x-1)
MCQ 124:

(22 1/2)° =

MCQ 125:

The additive inverse of a matrix A is

1. A
2. |A|