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Input:
integrate%28tan%28x%29%2C%20%28x%2C%200%2C%20pi/2%29%29
Error:
integrate%28tan%28x%29%2C%20%28x%2C%200%2C%20pi/2%29%29
unsupported operand type(s) for %: 'function' and 'Integer'
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