$\frac{d}{dx}\frac{1}{1+x^2}+\left(\frac{2x}{1+x^2}+arctanx\right)arctanx$
$b^2-z^2$
$6x-12=12$
$\frac{d^2}{dx^2}\left(x^3\right)\cdot x$
$2cscx-2secx$
$x^2-3x+2-1$
$\lim_{x\to0}\left(\frac{x^2}{x^2-x}\right)$
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