$\lim_{x\to\pi}\left(\frac{x+\pi secx}{x^2-\pi^2}\right)$
$-30a^2+25a^4+9a^4$
$3\cdot2x\cdot10^2$
$28^3$
$x^2-10x+19=0$
$-2^2^2^2^2^2$
$\left(1-3x\right)\cdot\left(-2x^2+5\right)$
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