Difference between Matlab solve and Mupad solve

Hello,

i have a problem with a difficult equation.

eq=-h-(R+x)*sin(atan(-y/(R+x)))+y*cos(atan(-y/(R+x)))

i want to solve this equation to R.

I can do this in the matlab console

syms h R x y 
eq=-h-(R+x)*sin(atan(-y/(R+x)))+y*cos(atan(-y/(R+x))) 
solve(eq,R)

then i get a solution.

But i want do it in Mupad, but it didnt work.

 eq:=-h-(R+x)*sin(atan(-y/(R+x)))+y*cos(atan(-y/(R+x))) 
 solve(eq,R)

as output i get my input...

i have no idea why.

Have anybody the same problem? Or has a solution for this problem? What is the difference of the Matlab solve and the MUpad?

regards

Heiko

Answer 1

[Walter Roberson]

Inside MuPAD you need to use arctan() rather than atan()