$-2r^2-40r-2=0$
$\lim_{x\to1}\left(\frac{\left(lnx\right)}{sin8\pi x}\right)$
$\lim_{u\to\frac{\pi}{4}}\left(sec^2u+csc^2u\right)$
$169x^2-100$
$-b^2c\left(a^3-2ab+3bc^3\right)$
$x^2\left(\frac{dy}{dx}\right)=1+y$
$a^1b^3-125y^3$
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