Question

4. Prove that: (1 - cos 0) (1 + cos 0) (1 + cos2 e) = 1.​

Answer 1

(1-cos 0) (1+cos 0) ( 1+ cos 2 0)

(1)^2 - (cos^20) ( 2 sin^2 0/2)

1-cos^2 0 . 2 sin^2 0/2

sin^2 0 . 2 sin^2 0/2