Which expression is equivalent to (sin x + 1)(sin x − 1)?

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Which expression is equivalent to (sin x + 1)(sin x − 1)?

Mathematics
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cos2x -cos2x cos2x + 1 cos2x − 1 -cos2x + 1
foil!!
|dw:1434123061043:dw| multiply

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Other answers:

D
First expand, then you can draw a conclusion: \[sin^2x-1=(1-cos^2x)-1=-cos^2x\]
nope how did you get that ?
also the expression is simply a difference of squares, so use the identity \[ (a-b)(a+b)=a^2-b^2\]
i am so confused if i foil i get D but you said no
\[sin^2x+cos^2x=1\] use that
foil yes what did you get after this ??
sin 2x -1
yes right now apply that identity sin^2 x + cos^2x =1 solve for sin^2x
\[\large\rm sin^2 x = 1-cos^2\] trig identity agree or no?

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