$\frac{2x\left(1-\left(4\right)+1\right)-2x}{x^{2}+y^{2}\sqrt{y^{2}+1}}$
$24\left(2\right)^1$
$2y\left(y+5\right)+6x\left(y+5\right)$
$\left(x^2-2\cdot x^2+2\right)+5$
$\frac{1}{cos^2x}-2+cos^2x$
$3xy+2x$
$a^2\left(4a^2+2a-6\right)$
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