What is the answer of 1-cot²a=?

2 Answers
Jun 21, 2018

It helps to rewrite in terms of sine and cosine.

1cot2a=1cos2asin2a=sin2acos2asin2a=cos2asin2asin2a=cos(2a)sin2a

Hopefully this helps

Jun 21, 2018

cos2asin2a

Explanation:

First answer:
f(a)=(1cot2a)=(1cota)(1+cota)
We can go further:
f(a)=(1cosasina)(1+cosasina)=
f(a)=(sinacosasina)(sina+cosasina)
f(a)=sin2acos2asin2a=cos2asin2a