$\lim_{x\to0}\:\left(1+x^2\right)^{\frac{1}{1-\cos\left(x\right)}}$
$\log\left(5x-2\right)-\log\left(2x\right)=1$
$\int c^5\ln\left(c\right)dc$
$3x^2+20x-7$
$\sin\left(x\right)\cos\left(-x\right)\sec\left(x\right)=\sin\left(x\right)$
$\frac{d}{dx}\left(4x+4\right)^{5x}$
$\frac{2}{x}+4>0$
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