$\csc\left(e-\frac{3\pi}{2}\right)$
$\left(5x-2\right)\left(7x+6\right)$
$2^2-2\left(2\right)\left(-3\right)+3^2$
$13-38+7x+2$
$\frac{4x^2-9}{x^3+1}\cdot\frac{x+1}{2x^2-7x-15}$
$\left(2x-1\right)\left(4x^2+2x-1\right)$
$y=\left(3x^2+1\right)^2$
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