Which of the following statements are identities?
A) $ \sin \theta=\cos \theta$
B) $ \sin (x)=\sin (x+4 \pi)$
C) $\sin ^{2} t+\cos ^{2} t=1$
D) $\cos (2 \theta)=2 \cos \theta \sin \theta$
E) $\csc x=\frac{1}{\sin x}$
F) $\cos \theta=\frac{\sqrt{3}}{2}$

Question

Quizplus · Accepted Answer

B) $ \sin (x)=\sin (x+4 \pi)$ is an identity because the sine function is periodic with a period of $2\pi$.C) $\sin ^{2} t+\cos ^{2} t=1$ is an identity known as the Pythagorean identity.E) $\csc x=\frac{1}{\sin x}$ is an identity because the cosecant function is defined as the reciprocal of the sine function.

Which of the Following Statements Are Identities? A) sin⁡θ=cos⁡θ \sin \theta=\cos \thetasinθ=cosθ

Which of the Following Statements Are Identities?
A) $\sin \theta=\cos \theta$