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Math Help - reference angles

  1. #1
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    reference angles

    I need to complete these problems and i need to get a perfect or if not ill fail pre-cal and have to take summer school! help please. Thanks a million!

    Express each function as the function of a reference angle.
    (in degrees)

    cot 100
    my answer: cot 80

    sin -290
    my answer:sin 70

    csc 140 ( can someone help me do this one?? I have no clue)

    (in radians)

    sin 8pi/11
    my answer: sin 3pi/11

    II. Find the value of each function.
    (its in degrees)

    cos 30
    my answer: sqrt.3/2

    sec 133 ( can someone help me how to do this one?)

    Thanks!
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  2. #2
    A riddle wrapped in an enigma
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    COT is negative in Q2 and Q4
    COT 100 = COT 280

    SIN is positive in Q1 and Q2
    SIN -290 = SIN 70 = SIN 110

    CSC = 1/SIN
    CSC 140 = CSC 40

    SEC = 1/COS
    COS is negative in Q2 and Q3
    SEC 133 - SEC 227
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