$y''+225y=0$
$y\frac{dy}{dx}-36x=0$
$\frac{1}{3^{4n+1}}$
$\left(y^2+x^3\right)^2$
$20+2\cdot43$
$\sqrt[2]{\left(3tan\right)^2+9}$
$\frac{1+tan^2\:y}{tan^2\:y}$
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