Question

HELP PLZZZZ
THANK YOU SO MUCH FOR HELPING ME!!!!

Answer 1

f(pi/2)=2
X=-2pi,-pi,0,pi,2pi
Range=-2,0,2

Answer 2

f(1/2 pi) = 2
I don't entirely remember how to do the second one so hang on
f(x) = 0 when x = k (pi) ?
Range: [-2,2]