Sine 60 degree ×cos 30 degree sin 30 degree ×cos 60degrre ka man gyat kare
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sin60.cos30.sin30.cos60
cos30.cos30.cos60.cos60 (by (90- theta) rule)
cos sq 30. cos sq 60
(√3/2)sq. (1/2)sq
3/4.1/4=3/16 ans
cos30.cos30.cos60.cos60 (by (90- theta) rule)
cos sq 30. cos sq 60
(√3/2)sq. (1/2)sq
3/4.1/4=3/16 ans
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