$4\::\:-1$
$\sqrt{40\sqrt{a}}$
$\frac{2}{1-\cos\left(x\right)}+\frac{2}{\sec\left(x\right)-1}$
$\lim_{x\to0}\left(\frac{\left(6^x-5^x\right)}{4^x-e^x}\right)$
$1.25x=10$
$\left(e^2+4\right)dy=ydx$
$\int\frac{3x-4}{x^3+x^2-9x-9}dx$
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