$\left(2n+3m\right)^2$
$u^2-18u+81$
$x\sqrt[1]{x-1}$
$\frac{\left(-3+4cos^2x\right)}{1-2sinx}$
$\int\left(\frac{5x^2+6}{x+2}\right)dx$
$\frac{\left(\sec\left(b\right)-\cos\left(b\right)\right)}{\cos\left(b\right)}=\tan^2\left(b\right)$
$a^2+a^2+1$
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