$\left(3a^2b+5ab^2\right)\left(3a^2b+5ab^2\right)$
$10x+9=4x-9$
$\left(-8\right)+6+5-\left(-3\right)+\left(-2\right)$
$y=\frac{1}{3}\sec\left(\frac{\pi x}{2}+\frac{\pi}{2}\right)$
$\frac{dx}{dy}+\left(x+1\right)y=3x$
$2-8x>-2+x$
$5x^2-20x$
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