Question

cos(A+B)-cos(A-B)

Answer 1

What's your question?

Answer 2

@Khushal_Shah Factorize it, I would guess.

Remember that cos(A+B) = cos(A)cos(B)-sin(A)sin(B), and cos(A-B) = cos(A)cos(B)+sin(A)sin(B)

Answer 3

Don't forget that signs will change since its cos(A+B) - cos(A-B)
It will be after using formulas : cosAcosB - sinAsinB - ( cosAcosB + sinAsinB )
Signs after braces will change and you will get your answer.....