Studying for math test

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Multiply; then use fundamental identities to simplify the expression below and determine which of the following is not equivalent.
(sin x + cos x) ^2

a. 1+2sinxcosx
b. sec^2x−tan^2x+2cosxsinx
c. sec x + 2 sin x/sec x
d. sin^2x+cos^2x
e. 1+2cos (pi/2 -x) cosx

  • Studying for math test -

    take a look at the related questions below. In particular,

    http://www.jiskha.com/display.cgi?id=1468255540

  • Studying for math test -

    ah ok, so would it be answer a?

  • Studying for math test -

    Read the question carefully. It said

    which of the following is not equivalent?

    Actually, both c & d are not

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