$\ln\left(x-3\right)=\ln\left(5x\right)+\ln\left(2\right)$
$0,1\:\cdot12$
$\int\cos\left(wx\right)dx$
$\frac{2cosec\:x\:-3cotg^2\:x\:-2}{3cosec\:x\:+1}+cosec\:x$
$\left(5b+3c\right)^2$
$\lim_{x\to0}\left(\frac{e^x-2cosx+e^{-x}}{xsinx}\right)$
$3b\left(2a+5\right)-4a\left(2a+5\right)$
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