$\left(x^2-3y^2\right)\cdot dx+2\cdot x\cdot y\cdot dy$
$2\sin\left(2x\right)\cos\left(4x\right)$
$y'y^{-2}=x^2$
$\sqrt{x^2+8x}-x$
$k2\:+\:16k\:=\:-37$
$\left(3-b\right)^2=9+b^2$
$\left(3x^3+9x\right)^3$
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