$x^2+y^2=169$
$1+49a^{4}-14a^{2}$
$\frac{dy^2}{dx^2}+4xy=0$
$7-\left(32-45\right)-56+\left(12-45\right)$
$75.1\:+56.13$
$\frac{dy}{dx}-6x=0$
$\:+\:\left(\:-\:3\:\:+\:\:5\:\:+\:\:2\:\:-\:\:1\right)\:\:\:.\:\:\:\left(\:-\:8\:\:-\:\:4\:\:+\:\:5\:\:+\:\:3\:\right)\:$
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