$x^4+4x^{-1}+\frac{4}{x^5}$
$\lim_{x\to0}\left(\frac{1}{3.5}\right)tangx$
$6x^2-7x-2=0$
$\left(2x^2-3x^3\right)^2$
$3x-5<34$
$\frac{1}{2}x^4-x^2$
$\left(3x^2y^2\right)\cdot\left(-xy^n\right)$
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