$400n^2-169m^4$
$\left(\frac{dx}{x}\right)+udu=0$
$\lim_{x\to\infty}\left(x^4-5x^2+6\right)$
$3x^2+2x-2x^2+5x+5$
$\int\left(sec12wtan12w\right)dw$
$\frac{x^2+4x-6}{x+1}$
$\int\frac{2x^3+10x}{\left(x+1\right)^2}dx$
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