Engineering Analysis

"B is equal to ZERO if and only if the equation is even function."
"But there is another special case..."

Discussion had been done among the 3E student especially our group. We found out that we can't officially prove the B function is equal to ZERO.

In this question, question 1 satisfied the equation:
f(x) = |x|

Due to the modulus is being used in this function, we can only take calculation part from ZERO to pi and double it up. However, if the calculation take part from pi to pi, A function will be ZERO. This is impossible because even function won't give ZERO in A function.

B function can be solved to ZERO by only take the calculation from pi to pi.

Opinion is needed from any of you who read this. However I will try my best to solve it if possible.