Input:
dsolve(ds(y,t,2)=ds(y,x,2)-ds(y,x)-exp(t)-exp(x))
Write:
`dsolve(ds(y,t,2)=ds(y,x,2)-ds(y,x)-exp(t)-exp(x))`
Output: $$ dsolve(\frac{d^{{2}}y}{dt^{{2}}}=\frac{d^{{2}}y}{dx^{{2}}}-\frac{d}{dx} y-exp(t)-exp(x)) == (-exp(t))+C_3\ (\frac{1}{2}\ {t}^{2}-x)+exp(x)\ x+C_1\ and\ C_1+C_2\ exp(x) $$ Result:$$(-exp(t))+C_3\ (\frac{1}{2}\ {t}^{2}-x)+exp(x)\ x+C_1\ and\ C_1+C_2\ exp(x)$$