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Math Help - Urgent...Trig...help please!!!!

  1. #1
    Newbie
    Joined
    Feb 2009
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    Michigan
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    Urgent...Trig...help please!!!!

    Problem 1
    If tan (theta) = 4, find
    a. tan (- theta)
    b. tan (theta + pi)
    c. tan (pi - theta)
    d. cot (pi/2 - theta)

    Problem 2
    The terminal ray for the angle theta is in the second quadrant. Which quadrants are the following rays in?
    a. neg theta
    b. theta + pi
    c. pi - theta
    d. pi/2 - theta

    Problem 3
    The terminal ray for the angle theta is in the third quadrant. Which quadrants are the following rays in:
    a. neg. theta
    b. theta + pi
    c. pi - theta
    d. pi/2 - theta

    Please explain!!!

    Please help!!! I have no idea where to start. This is homework due tomorrow and I am scheduled to meet a tutor tomorrow so I can learn this stuff.
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  2. #2
    MHF Contributor
    Joined
    Nov 2008
    From
    France
    Posts
    1,458
    Hi

    \tan(-\theta) = \frac{\sin(-\theta)}{\cos(-\theta)} = \frac{-\sin \theta}{\cos \theta} = -\frac{\sin \theta}{\cos \theta} = -\tan \theta
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