Trigonometric Identities

8 practice questionsPrecalculusStep-by-step solutions

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Which identity is true for all angles $\theta$ ?

\sin^2(\theta) + \cos^2(\theta) = 1

\sin(\theta) + \cos(\theta) = 1

\tan(\theta) = \sin(\theta) + \cos(\theta)

\cos^2(\theta) - \sin^2(\theta) = 1

tan θ is equal to:

A.cos θ / sin θ

B.sin θ / cos θ

C.1 / sin θ

D.sin θ · cos θ

Which identity expresses sin(2θ)?

A.2 sinθ cosθ

B.sin²θ − cos²θ

C.2 cos²θ

D.1 − 2sin²θ

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