$\lim_{x\to0}\left(\frac{ln\left(x+1\right)-1}{xln\left(x+1\right)}\right)$
$u\cdot u^2$
$-15-35.75+25$
$x^4+2x^3+x^2-900$
$2x+9=3x-12$
$\frac{25x^{-2}}{5^{-2}y}$
$\int xc^{x^2}dx$
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