+0

# Prove That

0
29
1

prove that 2tan2 θ +4cot4 θ = cot θ - tan θ

Mar 16, 2020

#1
+108727
+1

Just work on the LHS it is actually not particularly difficult.

you will need to know the expansion for $$tan(2\theta)$$ and from that   $$tan(4\theta)$$

The rest will just fall out.  Give it a go. :)

Mar 16, 2020