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OpenStudy (anonymous):
evaluate (sinx+cosx)^2 + (sinx-cosx)^2
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OpenStudy (noelgreco):
First: expand.
OpenStudy (anonymous):
I replaced sinx with 'a' and cosx with 'b'. In the end I got 2(a^2 + b^2)
OpenStudy (anonymous):
|dw:1360981008764:dw|
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