$\int2x\left(x^2+4\right)^2dx$
$dx=-sen\left(y\right)dy$
$\arccos\left(0.94\right)$
$\left(u-6\right)^2$
$\sec x\sin\frac{\pi}{2}-x$
$-13\:+\:-1\:+\:1\:+\:-17\:$
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