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Please explain, I'm lost on this one

Maybe using Sum or Difference Identity: cos(A+B) = cos A cos B - sin A sin B?

what is the question?

You say to find the exact value of the expression and then you don't give the expression.

sorry, cos(A+B)

cos(A+B)= cosAcosB-sinAsinB

That's as far as I've gotten I'm not sure on how to use the formula

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Use those values in the formula for cos (A+B)