Question

Cot. Cot(60 -A). Cot (60 + A) = Cot 3A

Answer 1

Step-by-step explanation:

find

1. sinA sin (60+A)sin(60-A) = 1/4 sin3A.

2.cos cos(60-A) cos(60+A)=1/4 cos3A.

then divide 2 from 1 to get

cotA cot(60+A)cot(60-A)= cot3A