$\frac{\cot\left(x\right)}{\tan\left(x\right)}+1=\cos^2\left(x\right)$
$5x^2,\:9xy,\:-6xy,\:7y^2,\:-x^2$
$\left(36\right).\left(42\right)$
$4a^2+36a^2+81$
$161\:-\left(-73\right)$
$\frac{x^2}{x^2+1}=1$
$9x^4+6x^2+1$
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