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## Homework Statement

how to guess the value of the integral sinax cosbx and for what values of a and b is your formula valid?

## Homework Equations

used the formula 1/2[(sin A-B)+sin(A+B)]

## The Attempt at a Solution

this is what i got -cos(a+b)/2(a+b)-cos(a-b)/2(a-b).after that to guess the values of a and b i am lost.

Any help would be appreciated

thanx in advance!!