Question

prove that
Sin^2 a =
$\frac{1 - \cos(2a) }{2}$
useless answer willbe reported​

Answer 1

Answer:

as explained below.

Step-by-step explanation:

cos( a+a) = cos a.cos a - sin a . sin a

cos 2a = cos^2 a -Sin^2 a

Cos 2a = 1- Sin^2 a - Sin^2a

Cos 2a = 1 - 2 Sin^2 a

2 Sin^2 a = 1 - Cos 2a

Sin^2 a = (1- Cos 2a)/ 2