$9^3+9^3+9^3$
$\lim_{x\to1}\left(1-tanx\right)\left(tan\left(\left(\frac{\pi}{2}x\right)\right)\right)$
$ydx+3xdy=0$
$\sqrt{\sqrt{x-5}+x}=5$
$\frac{d^3}{dx^3}\left(cot^2x\right)$
$-6x^2-7\left(-6\right)+4$
$50a^3b-84a^4b^2+45a^3b-18a^3b$
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