$13w-11-2-10$
$\left(ysenx-3cosy\right)dx+\left(3xseny-cosx\right)dy=0$
$\left(3\sqrt{x}+1\right)\left(3\sqrt{x}-1\right)$
$6x\:-\:6\:<\:3\left(5x\:+\:7\right)$
$30y^2+15yx-25y^2-5xy+5y^3-5xy+25y^3$
$4\cos\left(4x\right)=3$
$\frac{dx}{dy}=tan\left(y\right)$
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