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Input:
integrate(1/(x**2%20%2B%201)%2C%20(x%2C%200%2C%20oo))
Error:
integrate(1/(x**2%20%2B%201)%2C%20(x%2C%200%2C%20oo))
specify dummy variables for oo*Mod(C*Mod(C*x, 2), 20)*Mod(C*Mod(1/Mod(B*Mod(x**2, 2), 201), 2), 20)
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