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Discussion in 'DAT Discussions' started by msu08, Dec 28, 2008.

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  1. msu08

    msu08
    7+ Year Member

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    tan xdegree = tan (90 – x)degree when



    A. x = 0
    B. x = -30
    C. x = -45
    D. x = -60
    E. x = -90

    answer is C why???
     
    #1 msu08, Dec 28, 2008
  2. adizzle87

    adizzle87
    2+ Year Member

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    a) tan0 [0] vs tan 90 [1/0]
    b) tan(-30) [-1/rad3] vs tan(120) [-rad3/1]
    c) tan(-45) [-1] vs tan(135) [-1]

    The key is to know your triangles about your unit circle. Knowing the ASTC pnemonic (All Students Take Calculus) helps with getting the angle and signs right as well.
     
    #2 adizzle87, Dec 28, 2008
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