$\frac{a^{2x+2}-4b^{2x}}{a^{x+1}+2b^x}$
$\frac{6x^3+23x^2+11x-5}{2x+3}$
$5\int x^3dx$
$\left(\cot^2x+1\right)\left(\sec^2x-1\right)$
$205,56-24,3$
$2x+3x^2;\:x=3$
$\int\frac{1-3x+2x^2-x^3}{x\left(x^2-1\right)^2}dx$
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