Input:
pdsolve(ds(y,t,2)-2ds(y,x,2)-y^2-2x*y-x^2=0)
Write:
`pdsolve(ds(y,t,2)-2ds(y,x,2)-y^2-2x*y-x^2=0)`
Output:
$$pdsolve(\frac{d^{{2}}y}{dt^{{2}}}-2\ \frac{d^{{2}}y}{dx^{{2}}}-{y}^{2}-2\ x\ y-{x}^{2}=0)== (-x)-6.0\ \frac{1}{(C_1-t-x)^2}\ and\ (-x)-6.0\ \frac{1}{(C_1+t+x)^2}$$
Result: $$(-x)-6.0\ \frac{1}{(C_1-t-x)^2}\ and\ (-x)-6.0\ \frac{1}{(C_1+t+x)^2}$$
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