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OpenStudy (anonymous):
find sin7x-sin5x=2cos6x
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OpenStudy (dumbcow):
use these properties http://en.wikipedia.org/wiki/Trig_identity#Product-to-sum_and_sum-to-product_identities
OpenStudy (dumbcow):
\[\sin 7x - \sin 5x = 2 \sin x \cos 6x\]
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