$3,24\:x\:2,21$
$\int\frac{\tan\left(x\right)}{\tan\left(x\right)+\cot\left(x\right)}dx$
$\lim_{x\to\infty}\left(\frac{-4\ln\left(x^3\right)}{-2x^2+14x+1}\right)$
$9x^2+36x$
$-10x^{5}y^{2}\left(-3x^{4}y^{4}\right)$
$245x^4-45$
$16m^4\:+\:40m^2\:n^3\:+\:25n^6$
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