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integrate (4.0*2.71828182845905**(2*z**2)*z + 3)/(2.71828182845905**(2*z**2) + 3*z) from 0 to 3
integrate (4.0*2.71828182845905**(2*z**2)*z + 3)/(2.71828182845905**(2*z**2) + 3*z) from 0 to 3
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