e cos 60° Los 30°- sin 60° sin 30°
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Answer:
Question is cos 60°×cos30° - sin 60° × sin 30°
Answer
Identity used in sum :- cos A = sin ( 90 - A ) ( 1 )
:- sin A = cos ( 90 - A ) (2)
:- sin = 1/ cos
:- cos =1/ sin
=cos 60° . cos 30° - sin 60° . sin 30 °
=sin 30 ° . cos 30° - cos 30°. sin 30 °
=1/ cos30° . cos 30 ° - 1/sin 30 ° . sin 30 °
- ( cos 30 ° and cos 30° will cut )
- ( sin 30 ° and sin 30 ° will cut )
- so remaining
=1 - 1
= 0
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