$x^2=x+90$
$\lim_{x\to\infty}\left(1-\frac{2}{x}\right)^{4x}$
$\frac{tanx}{secx-1}-\frac{tanx}{secx+1}$
$m^2+17m+49$
$\lim_{x\to0}\left(\frac{14x^3}{e^{8x}}\right)$
$k\cdot\left(\frac{x^k}{3^{k+1}}\right)$
$\left|50\right|\cdot\left|-20\right|$
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