How do you express $cos(pi/ 2 ) * cos (( 11 pi) / 6 )$ without using products of trigonometric functions?

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Answer 1 · 2016-06-22T10:23:03

$cos(pi/2)*cos((11pi)/6)=color(green)(0)$

$cos(pi/2)=0$
and anything multiplied by $0$ is $0$

Answer 2 · 2016-06-22T10:26:13

Answer $=0.$

Using the value $cos(pi/2)=0,$ we get the answer $0.$

How do you express cos(pi/ 2 ) * cos (( 11 pi) / 6 ) cos(pi/ 2 ) * cos (( 11 pi) / 6 ) without using products of trigonometric functions?