I have a function to inverse, I proved that thise function is inversible but I didn't manage to find the expression of the inverse:
here is the function:
the function is decreasing for r< R/cos(theta)
so I have to find the expression of 'r' in function of y,P1, P2, alpha, N, R.
all the parameters here are positive; and r<R/cos(theta).
I used matlab (with 'solve' function) but it didn't manage to inverse this function.
Thanks for your precious help