Calculus - Need help please

Given the following​ function,
y=tan(pi-3x)

1)determine the interval for the principal cycle.
(^ Type your answer in interval notation)

2)Then for the principal​ cycle, determine the equations of the vertical​ asymptotes

3)find the coordinates of the center​ point

4) Find the coordinates of the halfway points.

( Direction - if needed type your points as ordered pair)

Thanks in advance. I'm clueless in this question. I have no idea where to begin or what to write.

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  1. Well, you know that the principal cycle for tan(x) is from

    -π/2 < x < π/2

    So, now you have

    -π/2 < π-3x < π/2
    -3π/2 < -3x < -π/2
    π/2 > x > π/6
    or, more usually written,
    π/6 < x < π/2

    But, you want the principal cycle to be near the origin, so shift it left one period (π/3) and you have

    -π/6 < x < π/6

    Use the same technique to answer the other questions. The graph is at

    http://www.wolframalpha.com/input/?i=tan(%CF%80-3x)

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