Q. 43.7( 38 Votes )

Is it right to sa

Answer :

Let us solve Left-Hand-Side:

cos (60° + 30°) = cos 90°


cos (60° + 30°) = 0 [, cos 90° = 0]


Now, solve for Right-Hand-Side:




cos 60° cos 30° - sin 60° sin 30° = 0


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