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Math Help - Need help before final

  1. #1
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    Feb 2009
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    Need help before final

    I'm trying to figure out how to do these, but I'm lost:

    Suppose A is in Quadrant IV and tan A = B. Write each one of the following values in terms of B.

    cotA=
    secA=
    cosA=
    sinA=
    cot(90°-A)=
    sin(2A)=

    __________________________________________________ ________________________________________

    Find all solutions Θ, 0° <= Θ < 360°
    cos(3Θ + 15°) = 1/2


    Thanks!
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  2. #2
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    Quote Originally Posted by coasterguy View Post
    I'm trying to figure out how to do these, but I'm lost:

    Thanks!
     \cot A = \frac{1}<br />
{{\tan A}} = \frac{1}<br />
{B} \hfill \\

    \sec A = \sqrt {1 + \tan ^2 A}  \hfill \\

    \cos A = \frac{1}<br />
{{\sec A}} \hfill \\

    Finish it all.
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  3. #3
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    Quote Originally Posted by coasterguy View Post

    cos(3Θ + 15°) = 1/2


    Thanks!
     \cos \left( {3\theta  + 15^\circ } \right) = \frac{1}<br />
{2} \hfill \\

     3\theta  + 15^\circ  = 60^\circ  \hfill \\

    finish it.

    {\text{OR}} \hfill \\

    3\theta  + 15^\circ  = 300^\circ  \hfill \\

    finish it.
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