$x^2-3x+x^2$
$\left(\sec^2\left(x\right)-1\right)\frac{1}{\sec^2\left(x\right)}$
$\left(2xy\:-\:1\right)^2$
$\int x\:5^{x^2+2}dx$
$\left|-2\right|+\left|8.5\right|$
$\frac{\sec\left(x\right)}{1-\sin\left(x\right)}$
$\left(3c\:+\:9\right)\left(3c\:-\:6\right)$
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