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OpenStudy (anonymous):
sin 9x cos x - cos 9x sin x
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OpenStudy (jdoe0001):
http://www.mathwarehouse.com/trigonometry/identities/images/angle-sum-formula-picture.gif <---- notice the example
OpenStudy (anonymous):
my options are sin10x cos8x sin8x cos10x
OpenStudy (raden):
use the identity : sin (a - b) = sin(a)cos(b) - cos(a)sin(b)
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