Question

The measure θ of an angle in standard position is given. Find the exact values of cosθ and sinθ for each angle measure. $-\frac{\pi }{2}$

Answer 1

Answer:

sin Ф = -1 and cos Ф = 0

Step-by-step explanation:

If the angle is -pi/2 (or -90 degrees), then the radius must be 1 and the opposite (vertical) side -1.  The horizontal (adjacent) side is 0.

Thus, the sine of this angle is opp/hyp = -1.

The cosine is adj/hyp = 0.