An angle in standard position measures pi over 2 radians, and cap p times open paren 0 comma 1 close paren is on the terminal side of the angle. What is the value of the cosine of this angle?
Answer
A
1
B
0
C
undefined
D
negative 1
Explanation
For the point (0, 1), the radius is 1, so the cosine is x/r = 0/1 = 0. The correct choice is D, 0.
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