$\int1000\left(1+3x\right)^{-1}dx$
$-4cosx\:+\:3\:=\:3$
$\left(x^2+36\right)\left(x^2-12x+36\right)$
$-4x^2\cdot7$
$\int3x^2\left(3x^3+5\right)^7dx$
$\int\frac{\left(x-22\right)}{\left(3x^2-2x-8\right)}dx$
$\frac{dy}{dx}+\frac{y}{x}=\:3x^2y$
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