$225x^2-144y^2$
$ab+4a^2b^2$
$cot\:\left(y\right)\:dy\:=\:\frac{1}{-\left(1-x^2\right)}dx$
$\frac{d}{dx}x^2y^3+2x^3=4x-5y$
$y'-2x-7y=0$
$\left(h-m\right)^4$
$\sqrt{10-x}+5=7$
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