Use the cofunction identities to write an expression that is equivalent to each of the following expression.

Question

a) sin(pi/6)

sin=cos(pi/2 - pi/6)

What do I do next?

Answer 1

what is π/2 - π/6 ??
= 3π/6 - π/6 = 2π/6 = π/3

so sin(π/6) = cos(π/3)

check:
sin(π/6) = sin 30° = 1/2
cos(π/3) = cos 60° = 1/2
All is good!