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Find the exact value of the expression using the provided information: cos A = -1/6 and cos B = -3/5 pi

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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?

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Other answers:

You say to find the exact value of the expression and then you don't give the expression.
sorry, cos(A+B)
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cos(A+B)= cosAcosB-sinAsinB
That's as far as I've gotten I'm not sure on how to use the formula
You know that both A and B are 3rd quadrant angles. That is given. So the sin and cos of both angles must be negative.
Use those values in the formula for cos (A+B)

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