Question

Sin a * sin B +cos (a+B)

Answer 1

Sinα * Sinβ + Cos(α + β) = Sinα * Sinβ + Cosα * Cosβ - Sinα * Sinβ =

= Cosα * Cosβ

Answer 2

The expression you've provided is:

sin(a) * sin(B) + cos(a + B)

This is a trigonometric expression involving the sine and cosine functions. To simplify it further or perform calculations, you'll need specific values for the variables "a" and "B." Without specific values for these variables, this expression cannot be reduced to a single numerical value.