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OpenStudy (anonymous):
prove (1+siny)[1+sin(-y)]=cos^2y
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OpenStudy (freckles):
hint sin(y) is an odd function
OpenStudy (freckles):
that is sin(-y)=-sin(y)
OpenStudy (freckles):
after that multiply the left and you are almost done
OpenStudy (anonymous):
Thank you :)
OpenStudy (freckles):
np
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