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How do you express $cos (3 \frac{π}{2}) \cdot cos (\frac{7 π}{12})$ $cos( 3 pi/ 2 ) * cos (( 7 pi) / 12 )$ without using products of trigonometric functions?

1 Answer

Apr 24, 2016

Zero.

Explanation:

$cos (\frac{3 π}{2}) = 0$ $\cos({3\pi}/2)=0$ .

Multiplying this by any real number still gives zero.

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