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Pre Calc

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evaluate the trigonometric function of the given quadrantal angle.

tan 1400°
cos 9π
cos 13π/2
sin (-17π)

  • Pre Calc -

    subtract multiple of 360° (1400/360 = 3.8..
    so
    tan 1400°
    = tan320° , 320 is in IV and 40° from the x-axis
    = -tan40
    = ....

    cos 9π
    = cos π , (took away 4 multiples of 2π)
    = -1

    cos 13π/2
    = cos π/2 (took away 6π)
    = 0


    sin(-17π)
    = sin(-17π + 18π) , ( I added 9 rotations)
    = sin π
    = 0

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