Question

Please I will mark as brainliest???

Answer 1

here is your answer

it is a sin or cos formulae
1. sin60° cos30° + cos60°sin30°
= sin ( 60°+30°)
= sin ( 90°)
= 1. ans

2. cos 60cos30 -sin60sin30
= cos ( 60+30)
=cos 90
= 0 ans

3. cos45cos30-sin45sin30
= 1/root2 × root3/2 - 1/root2 × 1/2
= root 3/ 2 root 2 - 1/ 2root2
= root3-1/ 2root2
Ans

4. sin60 sin45 - cos60cos45
= root3/2 × 1/root2 - 1/2 × 1/root2
root3/2 root 2- 1/2root2
root3 - 1 / 2 root 2
Ans


i hope it can help you