$\left(2xyz\right)\cdot\left(2x^2yz^3\right)$
$5\cos^2x=3\left(1+\sin x\right)$
$\lim_{x\to0}\left(\frac{3x^2-5}{2x^2+1}\right)$
$\frac{x^3-x^2+4}{-x^3-x+1}$
$\frac{d}{dx}ax^2+bx-c$
$-10-15-30-20-25-30+10$
$4\sqrt{x}-\frac{6}{3\sqrt{x^2}}$
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