$\lim_{x\to\frac{x}{4}}\left(\frac{cosx-senx}{cos2x}\right)$
$x^2+8x+14=0$
$-1728+216$
$9x^6-100^4$
$4x^2-17x+15$
$\frac{x^3+1}{x^2-2x}$
$\int\left(6x+2\right)^3dx$
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