$\frac{2}{\sin x}$
$3x^4-6x^2+3x$
$\left(a+15\right)\left(a-5\right)$
$m+6^2$
$\left(-1\right)^n\cdot\frac{x^{7n+2}}{6n+2}$
$2\left(-4\right)^2-3\left(-4\right)+1$
$\frac{2}{3}x-2z$
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