Question

Evaluate the following:

cos 60° cos 30° – sin 60° sin 30°

Answer 1

On substituting the values of various T-ratios, we get:
cos 60° cos 30° – sin 60° sin30°

=`(1/2 xx sqrt(3)/2-sqrt(3)/2 xx1/2)=(sqrt(3)/4 - sqrt(3)/4)=0`