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How do you express $cos (\frac{3 π}{2}) \cdot cos (\frac{15 π}{8})$ $cos( (3 pi)/ 2 ) * cos (( 15 pi) / 8 )$ without using products of trigonometric functions?

1 Answer

Jul 7, 2016

Since $cos 3 \frac{π}{2} = 0$ $cos3pi/2=0$ , the Answer is $0 .$ $0.$

Explanation:

Since $cos 3 \frac{π}{2} = 0$ $cos3pi/2=0$ , the Answer is $0 .$ $0.$

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