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| Math Central | Quandaries & Queries |
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Question from Sam: 1. express the following as a trigonometric function of angle x for cos (3pi/2 -x) |
Hi Sam,
I would use the identity
\[\cos(a+b) = \cos(a)\cos(b) - \sin(a)\sin(b) \mbox{ with } a = \frac{3 \pi}{2}, b = -x.\]
Write back if you need more assistance,
Penny
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