$x\frac{dy}{dx}=-\cot y$
$\left(6x-5y\right)\left(36x^2+3xy+25y^2\right)$
$1+6a^3+9a^6$
$\text{large}\:5x^2+20x=0$
$\frac{d}{dx}x^y$
$\lim_{x\to0}\left(\frac{x}{\sqrt{x+4}-2}\right)$
$1+5\cdot\left(a+1\right)<7\left(a+2\right)$
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