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Input:
fsolve(f(x+1)=f(x)+x)
Write:
`fsolve(f(x+1)=f(x)+x)`
Compute:
$$fsolve(f(x+1)=f(x)+x)$$
Output:
$$fsolve(f(x+1)=f(x)+x)== C_1-\frac{1}{2}\ x+\frac{1}{2}\ {x}^{2}$$
Result: $$C_1-\frac{1}{2}\ x+\frac{1}{2}\ {x}^{2}$$
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