$\frac{-2}{\frac{a}{a}}$
$f\left(x\right)=\sqrt{\frac{x^2-9}{x}}$
$45x^2+30x+15$
$\frac{d^2}{dx^2}\left(9x^3ln\left(7x\right)\right)$
$25-70z^2+94z^4+0z^3+0z$
$3x+2;x=0$
$\left(\sin\left(x\right)+\cos\left(x\right)\right)^2-1=sin2x$
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