Question

2 cos square theta - 1 = cos square theta - sin square theta

Answer 1

Answer:

2cos square theta -1

Step-by-step explanation:

cos square theta -1 -cos square theta

Answer 2

Step-by-step explanation:

Lhs - 2 cos 2 theta -1 = 2cos 2 theta - ( sin 2 theta + cos 2 theta ) = 2cos 2 theta - sin 2 theta - cos2 theta = cos2 theta - sin2theta = RHS