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Thread: Simple trigonometric equation can you help?

  1. February 26th 2009, 01:45 PM #1
    db5vry
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    Simple trigonometric equation can you help?

    tan theta = - root 3 is the question, obviously I'm trying to find theta here.

    I used inverse tan root 3 to get a value of 60, and then drew a trigonometric graph with active tan and got 150 and 300 for values of theta. Can anyone confirm this is right?
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  2. February 26th 2009, 02:07 PM #2
    skeeter
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    \arctan(-\sqrt{3}) = -60^{\circ}<br />

    -60^{\circ} + 360^{\circ} = 300^{\circ}

    other angle is back in quad II, 180 degrees out

    300^{\circ} - 180^{\circ} = 120^{\circ}
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