ODE No. 1606

\[ y''(x)+e^x \sin (y(x))=0 \] Mathematica : cpu = 20.5759 (sec), leaf count = 0

DSolve[E^x*Sin[y[x]] + Derivative[2][y][x] == 0,y[x],x]
 

, could not solve

DSolve[E^x*Sin[y[x]] + Derivative[2][y][x] == 0, y[x], x]

Maple : cpu = 0. (sec), leaf count = 0

dsolve(diff(diff(y(x),x),x)+exp(x)*sin(y(x))=0,y(x))
 

, could not solve

dsolve(diff(diff(y(x),x),x)+exp(x)*sin(y(x))=0,y(x))