Which expression is equal to $\sin\left(360^\circ+\theta\right)$sin(360°+θ)?
$\sin\theta$sinθ
$\cos\theta$cosθ
$-\sin\theta$−sinθ
$-\cos\theta$−cosθ
State whether each of the following are equal to $\cos\theta$cosθ or not.
Simplify the following.
Find the value of $\cos0^\circ$cos0°.