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March 26, 2017

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cot (theta)=-9/8, cos (theta)<0

  • Math - ,

    Are we solving for theta ??

    if so, then
    tan Ø = -8/9 and if cos Ø < 0
    Ø must be in quadrant II

    angle in standard position is 41.63°
    ( since tan 41.63° = +.888889 or 8/9 )

    so Ø = 180 - 41.63 or 138.37°

    check:
    tan 138.37 = -.888889
    cos 138.37 is negative.

    Change your calculator to Radians if you want those units

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