Question

cos 60° cos 30° – sin 60° sin 30°​

Answer 1

Answer:

1/2×√3/2-1/2×√3/2

=0

Answer 2

Answer:

according to trigonometric table

cos60=1/2

cos30=√3/2

sin60=√3/2

sin30=1/2

√3/2×1/2 -√3/2×1/2

=√3/4-√3/4

=0