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Thread: sine function transforms

  1. #1
    Junior Member pinion's Avatar
    Jan 2008

    sine function transforms


    say i have two functions, $\displaystyle y=3^x$ and $\displaystyle y=x+1.2$ and i wanted to find where they intersect. since $\displaystyle y=x+1.2$ is a line, if i could rotate both functions so that $\displaystyle y=x+1.2$ became the x-axis, $\displaystyle y=0$, then to find the intersection i would solve the now rotated $\displaystyle y=3^x$ by setting $\displaystyle y=0$, then un-rotating the solutions.

    firstly, how can i accomplish this rotation transform, and secondly, can i do more complex transforms, like $\displaystyle y=2^x$ and $\displaystyle y=x^2$ transformed so that $\displaystyle y=x^2$ becomes the x-axis? again, i would also have to de-transform the solutions. if i was at all fluent in calculus (took 4 semesters worth of it, haha, just don't remember much), then i'm sure i'd have a better idea on how to figure this out, or at least ask better questions.

    for this one, i visualize flattening out one curve, and the other one obeys the same movements. mathematically i think it would be taking lines perpindicular to $\displaystyle x^2$ and rotating each one into $\displaystyle y=0$ as in the first case.

    and for the real kicker (or maybe you'll just kick me), how about $\displaystyle y=sin(\pi*2^x)$ and $\displaystyle y=sin(\pi*2^{1-x})$? ..and again, de-transformation.

    transforming certain functions would cause the other to no longer be a function..not a good idea haha.
    given the range $\displaystyle 0<x<1$ could these last functions be modeled by a polynomial?

    thanks for any help or ideas!
    Last edited by pinion; Feb 2nd 2008 at 06:36 PM.
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