.Hi again fellow math gurus (minus "fellow")!
I'm trying to prove that:
1) sin(pi/2 - x) = sin(pi/2 + x)
This is how I went about it...
RHS = sin(pi/2) cos x + cos(pi/2) sin x
= (1) cos x
= cos x
I know that doesn't exactly work out and I'm stumped hahaha!
Use in both sides the angles sum identities:
2) This one is more recent:
(2 tan x)/(1+tan^2 x) = sin 2x
, and remember the duplication angle identity ( and, of course, the
trigonometric Pythagoras' Theorem).
I'm not looking for the answer so much as maybe a hint at what identities to start with? I tried going about it couple different ways but this stuff is just greek to me hehe. I'm trying to get really good at it before my final exam in 3 weeks.
Thanks for the continued support!