Studying for math test
posted by Lottie .
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 
Steve
take a look at the related questions below. In particular,
http://www.jiskha.com/display.cgi?id=1468255540 
Studying for math test 
Lottie
ah ok, so would it be answer a?

Studying for math test 
Steve
Read the question carefully. It said
which of the following is not equivalent?
Actually, both c & d are not
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