$4x^2-7x$
$\frac{10}{secx-1}$
$\lim_{x\to\infty}\left(\ln\left(\frac{x+1}{x+2}\right)\right)$
$\frac{4x^3+x^2}{x}$
$183+200$
$-ih\left[-aksin\left(kx\right)+iakcos\left(kx\right)\right]$
$100-25x^2$
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