Please help me with a math problem

This is a discussion on Please help me with a math problem within the A Brief History of Cprogramming.com forums, part of the Community Boards category; It's been around 10 years since I've done any serious maths, so I'm struggling with this. I have an equation ...

  1. #1
    Code Monkey Davros's Avatar
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    Please help me with a math problem

    It's been around 10 years since I've done any serious maths, so I'm struggling with this.

    I have an equation y = f(x) which looks like

    y = c ( sin(2x) + x )

    I want to re-arrange this to get the reverse, i.e. an equation for x given a value for y. So I would have x = f'(y)

    But I can't seperate the x's all onto one side. The nearest I can get is:

    x = 0.5 * asin( (y/c) - x )

    but this leaves me with x buried on the right hand side.

    Help please!

  2. #2
    Registered User red_baron's Avatar
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    this is all i can get
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  3. #3
    BMJ
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    sin(2x) = sin(x + x) = sin(x)cos(x) + sin(x)cos(x) = 2sin(x)cos(x)

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