$16m^2-40m+25$
$196f^12\:-\:400g^4$
$5\log\left(x-5\right)-3\log\left(x+8\right)$
$\int\frac{\sqrt{7+2tgx}}{cos^2x}dx$
$x^2+x-22=x-7$
$\lim_{x\to0}\left(\frac{xsin4x}{1-cos^3x}\right)$
$3^{13}$
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