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Math Help - trouble interpreting a problem

  1. #1
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    trouble interpreting a problem

    express each trigonometric function as a corresponding function of an angle in the first quadrant (0<= Theata <= PIE/2) preceded by a + or - sign:
    a)sin 9pie/2
    b)sin 7pie
    c)sin(-7pie/3)
    theres i # of problems, but only posting up to c.

    I figure like x is an angle, so f(x) is the function. so they want me to express a trig function as a function of an angle... but isnt a trig function already a function of an angle? and what do they mean preceded by a + or - sign, does that mean f(-x) ? yeah I dont get what they want me to do.
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  2. #2
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    Quote Originally Posted by frankinaround View Post
    express each trigonometric function as a corresponding function of an angle in the first quadrant (0<= Theata <= PIE/2) preceded by a + or - sign:
    a)sin 9pie/2
    b)sin 7pie
    c)sin(-7pie/3)
    theres i # of problems, but only posting up to c.

    I figure like x is an angle, so f(x) is the function. so they want me to express a trig function as a function of an angle... but isnt a trig function already a function of an angle? and what do they mean preceded by a + or - sign, does that mean f(-x) ? yeah I dont get what they want me to do.
    They want you to write it using an angle from 0^o to 90^o

    For example

    sinx=sin(x+2n{\pi})

    so for the first one

    \displaystyle\ sin\frac{9{\pi}}{2}=sin\left(4{\pi}+\frac{\pi}{2}\  right)
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