Question

3. Find the values of
1) cos 60°* cos 30+ sin 60° sin 30°​

Answer 1

Answer:

cos 60° * cos 30° + sin 60° sin 30°

= 1/2 × √3/2 + √3/2 × 1/2

= √3/4 + √3/4

= (√3+√3)/4

= 2√3/4

= √3/2