Question

(2)
If
sin 0 + sin2 0 = 1,
show that :
cos2 0 + cos4 0 = 1.​

Answer 1

Answer:

Given, Sin0 + Sin20 = 1

TPT :- Cos20 + Cos40 = 0

Now, Sin0 + Sin20 = Sin90°

0 + 20 = 90°

30 = 90°

0 = 30°

Hence we have to find the following :-

Cos 2 * 30° + Cos 4 * 30°

Cos 60° + Cos 120°

1/2 - 1/2 = 0

( Hence Proved )