$3x^2-13x-10$
$5\sqrt{\frac{16}{25}}+7\sqrt{\frac{36}{49}}$
$5x^4-3x^3+7x^2-4;\:x=2$
$\lim_{x\to0}\left(\frac{7^x-2^x}{x}\right)$
$\left(6x^6+x^8-4x^7-4x\right)^2$
$\lim_{n\to\infty}\left(n\sqrt[n]{a}-n\right)$
$\frac{d}{dx}\left(cos\left(xy\right)=xe^y\right)$
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