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How do you express $cos (\frac{π}{2}) \cdot cos (\frac{19 π}{12})$ $cos(pi/ 2 ) * cos (( 19 pi) / 12 )$ without using products of trigonometric functions?

1 Answer

Feb 25, 2016

Zero

Explanation:

The product = 0 because $cos (\frac{π}{2}) = 0$ $cos (pi/2) = 0$

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