किमती काढा: cos 60°×cos30° + sin 60°×sin 30°
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Answered by
4
Cos60°Cos30° + Sin60°Sin30°
Its something like,
Cos(a - b) = CosaCosb + SinaSinb
Cos(60 - 30)
= Cos30°
=> √3/2
Hope it helps u
Answered by
1
cos60×cos60+sin60×sin60=1
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