Question

The value of cos 60 degree × cos 30 degree - sin 60 degree × sin 30 degree

Answer 1

we know that sin60=root 3/2

cos30=root3/2

sin30=1/2

cos60=1/2

putting all values

we get

root3/2 × root3/2 + 1/2 + 1/2

root 3 × root 3 /2×2 + 1/ 2×2

3/4 + 1/4

= 1

HOPE THIS HELPS !!!!!!