i need to find the tan(a-b) knowing tan a=5/12, sin $= -4/5 and sec B= 25/24 the restriction is (pi/2)<$

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i need to find the tan(a-b) knowing tan a=5/12, sin $= -4/5 and sec B= 25/24 the restriction is (pi/2)<$

Mathematics
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what is dollar here? I guess you should use the fact that tan(a-b)=(tanA-tanB)/(1+tanAtanB)
sorry i didn't have a theta so i just put that instead. !! I used that but i keep getting the wrong answer so feel like im doing it wrong. Supposedly the answer is 204/253... D:
how did you use sin(theta)=-4/5 ? I cannot see how it can be.

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i didn't use it because i didn't think it was important to the equation D:
ok than how did you find out sin a?
i drew a triangle and used pythagorean to find the other side. Why do i need the sin? it's not even in the problem... is it?
If you find sin a than you are basically done, but it is not necessary I guess.
I feel bad now, I am doing calculus now, but I would not be able to solve this :(
it's ok i fail even more XD
try posting it again, hoping some wiser guy will help you
ok then thanx anyway ^^

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