$\lim_{x\to4}\left(4x+9\right)$
$\int\frac{x^3+x+1}{x^3+x}dx$
$3\cdot1$
$x^4-13x^2-12x$
$\int\sqrt{324-9x^2}dx$
$x^4+x^3-5x^2+3x$
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