$3\sec^2\left(x\right)+10\sec\left(x\right)=-8$
$7+5-3+9+4-6$
$\lim_{x\to-2}\left(\frac{x^2+8x+12}{x^2+2x}\right)$
$\left(x^2-6x-7\right)\left(3x^2-7x+15\right)$
$y'=4e^x+y$
$\frac{1}{1+\tan^2y}+\frac{1}{1+\cot^2y}=1$
$\left(x+2\right)^2+12\left(x+2\right)+27$
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