$\frac{7x}{x+3}-\frac{3}{x-2}$
$-16+9+1\cdot4^2-1\cdot1^3-1\cdot5^2$
$\int_1^5xe^{x^2}dx$
$\sqrt{x}\frac{dy}{dx}=y+\sqrt{x}$
$\int\frac{3}{x^2\left(x^2+1\right)}dx$
$\cot\left(1\right)-1=0$
$\int\left(tgx-ctg\right)^2dx$
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