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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<A<3pi/2 and pi<B<3pi/2
 one year ago
 one year 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
 one year ago
 one year ago

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felicia888Best ResponseYou've already chosen the best response.0
Please explain, I'm lost on this one
 one year ago

felicia888Best ResponseYou've already chosen the best response.0
Maybe using Sum or Difference Identity: cos(A+B) = cos A cos B  sin A sin B?
 one year ago

chihiroasleafBest ResponseYou've already chosen the best response.0
what is the question?
 one year ago

MertsjBest ResponseYou've already chosen the best response.0
You say to find the exact value of the expression and then you don't give the expression.
 one year ago

MertsjBest ResponseYou've already chosen the best response.0
cos(A+B)= cosAcosBsinAsinB
 one year ago

felicia888Best ResponseYou've already chosen the best response.0
That's as far as I've gotten I'm not sure on how to use the formula
 one year ago

MertsjBest ResponseYou've already chosen the best response.0
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.
 one year ago

MertsjBest ResponseYou've already chosen the best response.0
Use those values in the formula for cos (A+B)
 one year ago
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