$30-6\:x\:-3$
$14\cdot830\cdot123$
$\lim_{x\to4}\left(3x+1\right)$
$\left(sinx\right)\left(cosx\right)\left(cotx\right)-sin^2x=1$
$\lim_{x\to0}\left(\frac{sin\left(\sqrt{4x^4-6x^2+x}\right)}{x^2-x}\right)$
$\frac{4}{49}\left(m^2\right)-\frac{32}{7}\left(mn\right)+64n^2$
$1+-2\cdot7$
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