$\frac{dy}{dx}=\left(-cosx\right)tgy$
$\sqrt[3]{27a^2}b$
$\lim_{x\to\infty}\left(\frac{\sqrt{x+1}-3x}{x+2x}\right)$
$\frac{dy}{dx}=6\sin\left(x\right)y^3$
$17.-x^{2}+2xy+y^{2},x=2y=2.5$
$\lim_{t\to-1}\left(1-2t\right)$
$x^3+6x^2-13x-42$
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