Question

kindly expand all the formula
1) sinA+sinB
2)sinA-sinB
3)cosA+cosB
4)cosA-cosB

promise to mark you as brainliest ​

Answer 1

Solution :-

1) SinA+SinB = 2 Sin(A+B)/2*Cos(A-B)/2

2) SinA-SinB = 2 Cos(A+B)/2*Sin(A-B)/2

3)CosA+CosB = 2Cos(A+B)/2*Cos(A-B)/2

4) CosA-CosB = -2Sin(A+B)/2*Sin(A-B)/2