Question

2 sin^2theta -costheta=1​

Answer 1

Step-by-step explanation:

cos 2 (theta )= cos^2 (theta )- sin^2 (theta)

= 1-sin^2 ( theta) - sin^2( theta)

= 1- 2sin^2 (theta)

=> sin^2 (theta) = {1-cos 2 (theta) } × 1/2

Similarity,

sin ^2(2theta) = {1-cos 2( 2theta) } × 1/2