$x^2-\left(y-z\right)^2$
$\frac{1}{6x^2}=\:\frac{1}{2x}+\frac{7}{6x^2}$
$x^2-65x$
$2cos^2\left(6x\right)-1$
$\int\:\:x^4e^x\:dx$
$\int\frac{x^{2}+x-1}{\left(x^{2}+1\right)^{2}}dx$
$\left(-\frac{6}{n}\right)^2$
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