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OpenStudy (laneycynthia):
Write the expression as either the sine, cosine, or tangent of a single angle. sin 57° cos 13° - cos 57° sin 13°
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OpenStudy (arthur326):
That looks very much like the formula for the sine of the difference of two angles. (Well, it looks exactly like it!) Do you see what that difference is?
TheSmartOne (thesmartone):
Hint: sin(a - b) = sin a cos b - cos a sin b
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