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OpenStudy (anonymous):
sin(x-75°)-sin(x+75°)
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OpenStudy (dumbcow):
http://en.wikipedia.org/wiki/List_of_trigonometric_identities#Product-to-sum_and_sum-to-product_identities ----> 2 sinx cos x
OpenStudy (dumbcow):
sorry 2 cos x sin 75
OpenStudy (dumbcow):
haha not taking my time... it should be negative as well
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