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OpenStudy (anonymous):
How do you verify (cosx)(cosx+sinx)(sinx)=1
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OpenStudy (anonymous):
It can't be equal to 1.
OpenStudy (anonymous):
put, for example, x=0. then you get a zero answer or 0=1?
OpenStudy (solomonzelman):
true, can't be 90 either, |dw:1384803359541:dw|
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