Question

Verify the identity: Use the fundamental , sum-difference , & double-angle identities in the steps.

(sin A + cos A)² = sin 2A + 1

Answer 1

First try expanding the (x+y)^2 part
Recall
(x+y)^2=x^2+2xy+y^2

Answer 2

You will use a couple identities after and be done

Answer 3

\[(sinA+cosB)^2=sin^2A+2sinAcosB+cos^2A\]

Answer 4

Hmm... I wonder if @distinction could have done that part given the formula I gave

Answer 5

We should probably let the askers do some of the work.