Question

Cos2-sin2=1-2sin^2 please find the answer for this question

Answer 1

Hey

To prove:

cos^2-sin^2=1-2sin^2

LHS:

cos^2-sin^2

=1-sin^2-sin^2

=1-2sin^2 [cos^2=1-sin^2]

=RHS

Hence,proved