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OpenStudy (anonymous):
Write the expression as the sine, cosine, or tangent of an angle. cos 96° cos 15° + sin 96° sin 15° cos 81° cos 111° sin 111° sin 81°
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OpenStudy (whpalmer4):
Here's a nice table of trig identities. Learn them! http://www.sosmath.com/trig/Trig5/trig5/trig5.html
OpenStudy (anonymous):
cos 81°
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