$\lim_{x\to\infty}15x\cdot tan\frac{12}{x}$
$\lim_{x\to\infty}\left(3e^{-x}\right)^{\frac{1}{3\left(x\right)}}$
$\left(\sqrt{x}+\sqrt{7}\right)^4$
$2\sqrt{2}\:senucosu\:-\:\:\sqrt{6}cosu\:+\:\sqrt{3}\:\:-2senu\:$
$-5x^2-3x-6x^2+4x$
$y'+5=0$
$\frac{x^2+13x+42}{x+7}$
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