$\cot\left(-x\right)\cdot\tan\left(-x\right)$
$\sqrt{1-4x^2}y^{'\:}=x$
$\frac{c}{3}+5=3$
$\left(-1.4\right)\left(-0.8\right)\left(\frac{3}{10}\right)$
$4a+b-ac;\:a=-3;\:b=-4;c=2$
$\left(9-x\right)\left(4+x^3\right)$
$\lim_{x\to3}\left(\frac{x}{3}\right)^{\frac{1}{3-x}}$
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