Quote Originally Posted by Artificial View Post
How is that property useless? It pretty much gave the answer away.

f(x) = f(a-x)
cosx = sin(pi/2 - x)



This has nothing to do with straightforward trig integrals. If you look at my working, I didn't even bother integrating the trig, simply manipulated the integral to something more straightforward. If you're confident, I could post another question and reward you in LG
Because the integral of f(x) from 0 to a is not always f(a - x). That's dependent on what f is.
I'm pretty sure. Been many a year since I've taken Calculus, and I sure as Hell don't give a damn to do any more trig functions. If you wanna give me a Cal problem that doesn't involve trig functions, sure. I love math, 'cause it doesn't involve memorizing. Trig functions seemed like they were always about memorizing...