$x y ^ { \prime } = - x$
$243-\left(-20\right)$
$xdx+ydy\:=\:0$
$\left(\left(a^n+b^n+1\right)-c^{2n}\right)^2$
$6xy^2-3x^2y-2y^2x$
$1+csc^2x\:cos^2x=csc^2x$
$s^2-9s$
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