$\frac{3x^3-x^2+x-1}{x+1}$
$2x-x+1$
$\frac{secx}{1+tan^2x}$
$3\:-\:4\:\left(1\right)$
$x^4-2x^3+x^2$
$x^2+7+12$
$y'=\frac{3x}{2y}$
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