$\frac{d^7}{dx^7}\left(3x+5\right)^9$
$cos\left(x+\frac{\pi}{3}\right)+cos\left(x-\frac{\pi}{4}\right)$
$b^2-15b+34$
$\lim_{x\to0}\left(\frac{x^6-1}{x^4-1}\right)$
$\cos\left(x\right)=0,025$
$\lim_{x\to0}\left(3+\frac{2}{3}s\right)$
$\:\left(4x-7\right)\left(4x+2\right)\:$
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