Question

1) sin(A+B) sin (A-B)=
A) 2sin A sin B
B) 2cosA sinB
C) 2cosAcosB
D) 2sin AcosB
2)cos(A-B)-cos(A+B)=
A) 2sin A sin B
B) 2cosA sin B
C) 2cosA cos B
D) 2sin A cos B​

Answer 1

Answer:

Please check Ist question and it's options you missed something in it...

Sin(A+B)+Sin(A-B)=2SinACosB

Sin(A+B)-Sin(A-B)=2CosASinB

Cos(A-B)-Cos(A+B)=2SinASinB