sin Pi/2 = cos______

Question

The question is all I am given and I know it is unit of a circle

Answer 1

The prefix co- means complementary. This is useful in order to remember the following identity.

 

This is how the three pairs of trig functions are related:

 

cos θ = sin(π/2 - θ)

 

csc θ = sec(π/2 - θ)

 

cot θ = tan(π/2 - θ)

 

So one answer to your question is 0.