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felicia888
 3 years ago
Find the exact value of the expression using the provided information: cos A = 1/6 and cos B = 3/5 pi<A<3pi/2 and pi<B<3pi/2
felicia888
 3 years ago
Find the exact value of the expression using the provided information: cos A = 1/6 and cos B = 3/5 pi<A<3pi/2 and pi<B<3pi/2

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felicia888
 3 years ago
Best ResponseYou've already chosen the best response.0Please explain, I'm lost on this one

felicia888
 3 years ago
Best ResponseYou've already chosen the best response.0Maybe using Sum or Difference Identity: cos(A+B) = cos A cos B  sin A sin B?

chihiroasleaf
 3 years ago
Best ResponseYou've already chosen the best response.0what is the question?

Mertsj
 3 years ago
Best ResponseYou've already chosen the best response.0You say to find the exact value of the expression and then you don't give the expression.

Mertsj
 3 years ago
Best ResponseYou've already chosen the best response.0cos(A+B)= cosAcosBsinAsinB

felicia888
 3 years ago
Best ResponseYou've already chosen the best response.0That's as far as I've gotten I'm not sure on how to use the formula

Mertsj
 3 years ago
Best ResponseYou've already chosen the best response.0You 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
 3 years ago
Best ResponseYou've already chosen the best response.0Use those values in the formula for cos (A+B)
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