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Math Help - trigonometry help i got the first one but the next to i can't figure out.

  1. #1
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    trigonometry help i got the first 2 and the 3rd might be right but it says 2 values.

    Determine the value of the following if 0degrees is less than or = to theta and theta is less than 360.
    Note:there are 2 values for each

    ex/ cos theta= -root2/2 = 135 degrees, 225 degrees


    1) sec theta= -root2 = 135 degrees, 225 degrees



    2) cot theta= infinite = 180 degrees, and i dont no how there is another value in this one
    Last edited by Dave19; July 6th 2008 at 08:31 AM.
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  2. #2
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    2) 0 degrees and 180 degrees.

    How to find it?
    Dave, I want you to draw a circle with a radius of 1 on the graph, and observe. Plot the primary points: For 0 degrees: (1, 0), for 90 degrees: (0, 1), for 180 degrees: (-1, 0), for 270 degrees: (0,-1). Then join these 4 points to form a circle. Remember that the points are actually P(cos(x), sin(x)). What do you see at 0 degrees? The points are (1, 0). So, cos (0)=1, and sin(0) =0.

    cot(theta) = cos(theta)/sin(theta) = 1/0 = Infinity
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