QuestionAn equivalent trigonometric expression for $\cos \left[x+\frac{\pi}{2}\right)$ is $\sin x$ $-\sin x$ $\cos x$ none of the above
Question 15 (3 points) $\checkmark$ Saved
An equivalent trigonometric expression for $\tan (-x)$ is $\cot x$ $\tan x$ $-\cot x$ $-\tan x$