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OpenStudy (anonymous):
prove that sinx + siny + sinz - sin ( x+ y+z) = 4 *sin ( x+y/2 ) * sin ( y + z / 2) * sin ( z + x / 2 )
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OpenStudy (anonymous):
please help :(
OpenStudy (xapproachesinfinity):
use sum to product identities to prove that
OpenStudy (xapproachesinfinity):
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