# Double Angle Identities Quizzes Online MCQs PDF Download eBook

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"Cos(α + β)cos(α - β) =", double angle identities Multiple Choice Questions (MCQs) with choices *sin²α-cos²β, cos²α-sin²β, 2cosα, and 2sinα* for ACT test. Practice double angle identities questions and answers to improve problem solving skills for SAT test.

## Double Angle Identities Questions and Answers PDF Download eBook

MCQ: Cos(α + β)cos(α - β) =

- cos²α-sin²β
- sin²α-cos²β
- 2cosα
- 2sinα

A

MCQ: A ∪ ( B ∩ C ) =

- ( A ∪ C) ∪ ( A ∪ C)
- (B ∩ B) ∩ ( A ∩ C)
- (A ∪ B) ∩ C
- ( A ∪ B ) ∩ (A ∪ C)

D

MCQ: The roots of the quadratic equation 2x² - 5x + 3 = 0 are

- equal
- imaginary
- irrational
- real and unequal

D

MCQ: A radian is the measure of the central angle of an arc of a circle whose length is equal to the

- half of radius of the circle
- diameter of circle
- radius of the circle
- one-third of radius of the circle

C

MCQ: For all n belong to Z, ( cosθ + ι sinθ )n

- csc nθ + ι sin nθ
- tannθ +ι cotnθ
- cosnθ + ι sinnθ
- cosnθ - ι sinnθ

C