$-18x^6y^2-3x^2y^6+6xy^4$
$2x^2+1x-1$
$5\left(k\:+\:6\right)\:+\:7\left(k\:-\:4\right)$
$\frac{sin^2\left(x\right)-cos^2\left(x\right)}{1-2cos^2\left(x\right)}$
$19+24-\left(-31\right)$
$\left(2x-11y\right)^2$
$\frac{\left(-1\right)^{n+1}x^n}{4^n}$
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