Recent content by mr0no

Exactly

How can I be sure if I can apply a function to both sides of an equation and preserve equality? for example: x = y ⇔ x2 = y2 or x = y ⇔ \sqrt{}x = \sqrt{}y or x < y ⇔ log(x) < log(y) What's up with that?

Thanks for giving me a tip instead of solving the whole thing for me. That's just what I need. I guess I will be revising trig identities tomorrow :)

Homework Statement Prove sinx/(2sin(x/2)) = cos(x/2) and (sin(x) cos(x/2^(n+1)))/(2^n(sinx/2^n)) = sinx/(2^(n+1)sin(x/(2^n+1))) Homework Equations The Attempt at a Solution