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.