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anonymous

  • 5 years ago

i need to find the tan(a-b) knowing tan a=5/12, sin $= -4/5 and sec B= 25/24 the restriction is (pi/2)<$<a<(3pi/2)<B<2pi. This is for precalc class and is kind of my last resort... I don't know how this site works actually, but please help ^^

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  1. anonymous
    • 5 years ago
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    what is dollar here? I guess you should use the fact that tan(a-b)=(tanA-tanB)/(1+tanAtanB)

  2. anonymous
    • 5 years ago
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    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:

  3. anonymous
    • 5 years ago
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    how did you use sin(theta)=-4/5 ? I cannot see how it can be.

  4. anonymous
    • 5 years ago
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    i didn't use it because i didn't think it was important to the equation D:

  5. anonymous
    • 5 years ago
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    ok than how did you find out sin a?

  6. anonymous
    • 5 years ago
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    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?

  7. anonymous
    • 5 years ago
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    If you find sin a than you are basically done, but it is not necessary I guess.

  8. anonymous
    • 5 years ago
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    I feel bad now, I am doing calculus now, but I would not be able to solve this :(

  9. anonymous
    • 5 years ago
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    it's ok i fail even more XD

  10. anonymous
    • 5 years ago
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    try posting it again, hoping some wiser guy will help you

  11. anonymous
    • 5 years ago
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    ok then thanx anyway ^^

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spraguer (Moderator)
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