$- y d x + 4 x d y = x ^ { 2 } d x$
$-3\tan\left(x\right)=0$
$\int_0^r\frac{x}{\sqrt{r^2+x^2}}dx$
$3x^2-5x+65=63$
$\lim_{x\to0}\left(\frac{sin\left(x\right)}{\ln\left(x+1\right)}\right)$
$4x^2-12x-40=0$
$6y-45+3y^2$
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