$9x^4-16x^6$
$2sin^2x=3cos^2x$
$\left(12b+3\right)\left(12b-3\right)$
$\lim_{x\to\infty}\left(x-1\right)x^2$
$0,23+-0,2$
$\frac{2x^2-15x+25}{2x^2+10x}$
$\frac{2^n}{n^2}\left(x-3\right)^n$
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