$\frac{30.750}{15.600}$
$9x^3-6x^3-12x+15x^2-10x-30$
$25\sin^2\:x\:-\:9$
$\int\frac{1}{x^2-9\:}dx$
$\left(3x+2\right)\left(3x-2\right)=9x^2-8$
$x+z-z$
$-2443+4354$
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