Question

I'm stuck, please help :P (there's a picture with the proper equation format in the discussion post below)

Answer 1

I've got sinA = 5/13 cosA = 12/13 sinB = 8/17 and cosB = 15/17

Answer 2

alright you hae restrictions 0<=A<=90 for cos(A) what does this tell you about what sign cos is

Answer 3

Does it mean that cos will be positive? This is the part that throws me off

Answer 4

yes it means that cos(A) is positive

Answer 5

Awesome, so cos(A) = 12/13 is correct?

Answer 6

90<=B<=180

Answer 7

yes

Answer 8

now what is Sin(accounts to y variable) when it's between 90-180

Answer 9

Would it also still be positive because sincose is positive in the second quadrant?

Answer 10

yes sin is positive cos is negative in the 2nd due to it being the x values

Answer 11

Oh, so cos(B) would = (-15/17)?