$-9+n=15$
$\lim_{x\to0}\left(1-cos\:x\right)^{2x}$
$\int\sin\left(10x+2\right)dx$
$3\left(x-4\right)^2-13\left(x-3\right)=3$
$\:-6+9x+1+3x$
$6^{-2}\cdot6^1$
$\frac{2x^3-x^2-31x+35}{2x-7}$
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