Posted by Antia on Monday, January 23, 2012 at 8:57pm.
Use the cofunction identities to write an expression that is equivalent to each of the following expression.
a) sin(pi/6)
sin=cos(pi/2  pi/6)
What do I do next?

Math  Reiny, Monday, January 23, 2012 at 10:47pm
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!