$\frac{6xy^2}{yz}$
$1\ge-z$
$x^4+x^2y^2+x^4$
$\left(-7\right).\left(+3\right)+\left(+4\right)-\left(2+5-1\right)$
$-x^2+x+nx=e^{ky+c}$
$20\:\cdot\:-5$
$\frac{\tan^2\left(x\right)+1}{\tan\left(x\right)}$
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