Using the method of u-substitution,

$\displaystyle \int_{2}^{4} x^{2} (1 + 3 x^{3})^{3} \, dx = \int_{a}^{b} f(u) \, du$

where

u = (enter a function of x)
du = dx (enter a function of x)
a = (enter a number)
b = (enter a number)
f(u) = (enter a function of u).

The value of the original integral is .

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