$\lim_{x\to3}\left(x^3-5x^2-4x+9\right)$
$\int\left(8x^3-7\right)\left(2x^4-7x\right)^6dx$
$\int e^{-7x}\cdot\cos\left(15x\right)dx$
$4\sin x\cos x=3\cos x$
$\int x\left(3x^2+6x+2\right)dx$
$\int\frac{e^u}{1-e^u}dx$
$x+5=7$
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