How do you express $cos (\frac{π}{2}) \cdot cos (\frac{5 π}{6})$ $cos(pi/ 2 ) * cos (( 5pi) / 6 )$ without using products of trigonometric functions?

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Answer 1 · 2016-07-23T01:04:48

$cos (\frac{π}{2}) = 0$ $cos(\pi/2)=0$ . Therefore any product involving that factor is also zero.

How do you express cos(π2)⋅cos(5π6)cos(pi/ 2 ) * cos (( 5pi) / 6 ) without using products of trigonometric functions?