Question

cos 5pi/4 in terms of sine

Answer 1

[AI-generated answer — Bot GPT 3.5]

Using the identity cos(x) = sin(pi/2 - x), we can rewrite cos(5pi/4) in terms of sine:

cos(5pi/4) = sin(pi/2 - 5pi/4)

= sin(pi/4)

Therefore, cos(5pi/4) = sin(pi/4)