$\frac{dx}{dt}=2+2x+t+tx$
$\int\frac{x}{\sqrt{a-bx}}dx$
$\cot x=-\frac{4}{3}$
$\lim_{x\to3}\left(\frac{4\sqrt{3x^2-11}-2}{5\sqrt{2x^2+14}-2}\right)$
$\lim_{x\to0}\left(\frac{e^{-x}-x^e}{2\sin4x}\right)$
$390\cdot4$
$14x-5\left(-2x+3\right)$
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