Verify that the following equation is an identity? sin4x = 4 sinx cosx - 8sin^3x cosx

neela | Student

LHS=sin4x = 2sin2x cos2x =

=2sin2x[ cos^2x-sin^2x]=4sinxcosx[1-2sin^2] =

=4sinxcosx-8sin^3xcosx =RHS

Access hundreds of thousands of answers with a free trial.

Start Free Trial
Ask a Question