Math, asked by wanphai999, 3 months ago

Pove that Cos 60° Cos30°-Sin60° Sin30°=Cos90°

Answers

Answered by baruahpronobjyoti16

1

Answer:

LHS=Cos 60° Cos30°-Sin60° Sin30°

now putting the value of the trigonometric variables

=Cos 60° Cos30°-Sin60° Sin30

=1/2×√3/2-√3/2×1/2

=√3/4-√3/4

=0

=cos90°

=RHS

hence proved

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