$\lim_{x\to1}\left(\frac{1}{x}\right)^{\tan\left(\frac{\pi}{2}x\right)}$
$-21\left(a+2\right)+14$
$\int\frac{4x^2}{\left(16+x^2\right)^2}dx$
$9-240+220\cdot19-19$
$\lim_{x\to\infty}\left(x\:sen\left(\frac{1}{2}\right)\right)$
$\frac{63-20+2}{+2-3}$
$\frac{1}{4-3x-x^2}$
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