$cot^2xsecx=cotxcscx$
$\left(2b+6\right)\cdot b$
$dy+2y=4xdx$
$-8x-6:4$
$\int\:\frac{x-3}{\left(5-4x-x^2\right)^{\frac{3}{2}}}dx$
$\frac{x^6+2x^4+6x-9}{x^3+3}$
$\int\cot^2x\:dx$
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