How to square a piecewise function? :/

[Brown Arrow]

how to square a piecewise function? urgent :/

Homework Statement

square the following piecewise function
f(x)= 0 [-pi,-pi/2)
pi [-pi/2,pi/2)
0 [pi/2,pi)

Homework Equations

N/A

The Attempt at a Solution

so i think this is how you do it:
(0)² + (pi)² +(0)² is this ocrrect?

or is it the following:

(0+pi+0)²? I am so lost:/

( I am trying to find the energy of the k^th harmonic so i need to square the function first) :/

thanks in advance
BA

 

[CompuChip]

Why do you expect that the square of a piecewise function has the same value everywhere?

You just need to calculate f(x)² which can give different values depending on what x is.