SymPy Gamma

Input:

integrate(tan(x)%2C%20(x%2C%200%2C%20pi/2))

Error:

integrate(tan(x)%2C%20(x%2C%200%2C%20pi/2))

specify dummy variables for pi*Mod(C*Mod(C*x, 2), 20)*Mod(C*Mod(tan(x), 2), 20)/2

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