anonymous
  • anonymous
Find the exact value of the expression using the provided information: cos A = -1/6 and cos B = -3/5 pi
Trigonometry
jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
Please explain, I'm lost on this one
anonymous
  • anonymous
Maybe using Sum or Difference Identity: cos(A+B) = cos A cos B - sin A sin B?
chihiroasleaf
  • chihiroasleaf
what is the question?

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Mertsj
  • Mertsj
You say to find the exact value of the expression and then you don't give the expression.
anonymous
  • anonymous
sorry, cos(A+B)
anonymous
  • anonymous
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Mertsj
  • Mertsj
cos(A+B)= cosAcosB-sinAsinB
anonymous
  • anonymous
That's as far as I've gotten I'm not sure on how to use the formula
Mertsj
  • Mertsj
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.
Mertsj
  • Mertsj
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Mertsj
  • Mertsj
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Mertsj
  • Mertsj
Use those values in the formula for cos (A+B)

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