Find the exact value. Do not use a calculator.
-$\cos \frac { \pi } { 2 }$
A) $- 1$
B) 1
C) 0
D) undefined

Name: Find the exact value. Do not use a calculator. -$\cos \frac { \pi } { 2 }$ A) $- 1$ B) 1 C) 0 D) undefined
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Question

Quizplus · Accepted Answer

The cosine of $\frac{\pi}{2}$ radians (or 90 degrees) is 0, as it represents the x-coordinate of a point on the unit circle at this angle, which is at the top of the circle where the x-coordinate is 0.

Find the Exact Value cos⁡π2\cos \frac { \pi } { 2 }cos2π​

Find the Exact Value $\cos \frac { \pi } { 2 }$