How do you express $cos(pi/ 2 ) * cos (( 17 pi) / 12 )$ without using products of trigonometric functions?

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Answer 1 · 2016-02-24T13:46:01

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Consider $cos(pi/2) = 0$

hence $cos(pi/2) . cos((17pi)/12) = 0 xx cos((17pi)/12) = 0$

How do you express cos(pi/ 2 ) * cos (( 17 pi) / 12 ) cos(pi/ 2 ) * cos (( 17 pi) / 12 ) without using products of trigonometric functions?