$\frac{dy}{dt}=\frac{3}{xe^{t+7x}}$
$-2x^4+4x^3+6x^2$
$21\cdot39$
$125x^9-64y^6z^{15}$
$sin\:2x\:-\:sin\:x\:=\:0$
$\left(\frac{-7z^3y^3}{11}+\frac{5y^2z^5}{14}\right)^2$
$\int_0^{\infty}\left(\frac{1}{\left(x+1\right)\left(x+5\right)}\right)dx$
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