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How do you express $cos (\frac{3 π}{2}) \cdot cos (\frac{7 π}{8})$ $cos( (3 pi)/ 2 ) * cos (( 7 pi) / 8 )$ without using products of trigonometric functions?

1 Answer

Feb 27, 2016

Zero

Explanation:

Since $cos (\frac{3 π}{2}) = 0$ $cos ((3pi)/2) = 0$ , then the product is zero.

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