$\left(e^y+1\right)^2e^{-y}dy=-\left(e^x+1\right)^3e^{-x}dx$
$\int_1^{ln\left(x\right)}\left(\frac{ln\left(t\right)}{t^4}\right)dt$
$\log_a^x=y$
$4^2+4x+1$
$-27x^2+5x+4$
$\lim_{x\to1}x$
$( 5 b ^ { 2 } - 2 c ) ^ { 3 }$
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