Partial Differential Equation Non Linear

Hello

I've being trying to solve for some time the set of PDE below, but I've been less than success. Please, I would appreciate any help. I'm using the function pdenonlin , but every time I run it I got an error ( sometimes step size too small, other Unsuitable initial guess U0).

equation 1: v= 75 = -5.7008e+011*sinh(4.0821e+017(cos(27)-cos(x))

equation 2: v= 75 = -(dx/dt)*(1-cos(x)).^2/((2-3*cos(u)+cos(u).^3).^(4/3))

• where (dx/dt) is the partial derivative of x as a function of t.

thank you Jhonatam

[Walter Roberson]

You have a mismatched ( in your equation 1.

Is your cos(27) the cosine of 27 radians?

Are the 'v=' parts both extra bits that should not be there, with the real equations being 75 = <etc> ?

Is your system of equations,

75 = -0.57008e12*sinh(0.40821e18*(cos(27)-cos(x(t))))

and

75 = -(Diff(x(t), t))*(1-cos(x(t)))^2 / (2-3*cos(u)+cos(u)^3)^(4/3)

If so, then Maple claims there is no solution.