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Math Help - Finding trig functions.

  1. #1
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    Finding trig functions.

    Hi, I'm having trouble with this problem. I'm supposed to find the trig functions. If I can have some help on part a I think I can do the rest on my own.

    1. Suppose that
    cosθ =−1/3, where π <θ < 3π/2.
    Find and simplify the following. Draw a picture to help explain your answer.


    a)
    tanθ


    I was able to draw a picture and determine that the point lies in quadrant 3. Do I need to use a pythagorean equation to find sinθ and then use that to find tanθ?


    Last edited by FatimaA; May 26th 2013 at 10:18 AM.
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  2. #2
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    Re: Finding trig functions.

    FatimaA
    your question is not clear....are you trying to solve the trigonometric equations cosθ =1/3 and sina = 4/5....please explain.
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  3. #3
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    Re: Finding trig functions.

    Hi Minoanman. I'm trying to solve the trig functions for cosθ = -1/3 for now. Sinα =−4/5 is a different point on the circle. I'll edit that out of the OP so it's less confusing.
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  4. #4
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    Re: Finding trig functions.

    Fatima A
    Please use correct language for mathematics...you are trying to solve a trigonometric equation...not a function!!!
    anyway cosθ = -1/3 has a solution θ = 109.5 degrees..use a scientific calculator it is easy.... don't forget to limit your solutions only into the interval given .
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  5. #5
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    Re: Finding trig functions.

    Minoanman, I'm trying to find tanθ where cosθ = -1/3 and where π <θ < 3π/2. Sorry that wasn't clear.
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