$\int\frac{1}{\sqrt{x^4+8x^2+16}}dx$
$\lim\:_{x\to\:\:3}\left(\frac{4x^2-22x+30}{x^5-27x^2}\right)$
$57\cdot19$
$sin\left(3x+7y\right)-sin\left(3x-7y\right)$
$\frac{30x^5-11x^4+12x^3+52x^2+x-12}{5x+4}$
$\frac{dy}{dx}-2y=e^{-x}y^2$
$a+b+c=15$
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