$\lim_{x\to\frac{\pi}{2}}\left(\frac{2x-\pi}{cos^2x}\right)$
$\int_2^4\left(2y\right)dx$
$\left(\frac{3r^6n^3}{2r^5n}\right)^4$
$\sqrt{x^2y}$
$18+x\le605$
$6uv^3+5u^3v$
$\sqrt{x^2+14x+49}=8$
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