$cos2x=\frac{15}{17}$
$\frac{7^5-k^5}{7+k}$
$5+x>-11$
$\lim_{y\to\infty}\left(ln\left(y-x\right)-ny\left(ln\left(x\right)\right)\right)$
$7x^2-28x+14$
$x+5x-3x+6$
$\int\left(49+x^2\right)^{-5}dx$
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