$\int\left(2x^2+1\right)^7x^2dx$
$\lim_{x\to\infty}\left(\frac{5\cos\left(x\right)+9\sin\left(3x\right)-5}{\sin\left(4x\right)-\sin\left(5x\right)+2x}\right)$
$in\left(x^5\left(3x+7\right)^9\right)$
$tanx=5,6$
$\:21\:+\:1-2$
$t^2+2t-43=0$
$14m^2+21$
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