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OpenStudy (anonymous):
Verify the given identity; sinxsin(x+y) + cosxcos(x+y) =cosy
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OpenStudy (anonymous):
2 sin((x + y + x - y)/2)*cos((x + y -x +y)/2) ------------------------------------------------- 2cos((x + y + x- y)/2) *cos(x + y -x + y) sinx ------- cosx tanx
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