Problem:
Find an indefinite integral (which can vary by a constant) of the following function:
$16 x^3 \sec ^2\left(4 \left(x^4+1\right)\right)$
Answer:
$\tan \left(4 x^4+4\right)$
{'source': 'AMPS', 'file': 'amps/mathematica/calculus/integrals/7194.txt'}