$45\cdot111$
$ydy-4xdx=0$
$-4mn-4mn$
$\int\:\log\:\:x\:x^7\:dx$
$\lim_{n\to\infty}\left(\frac{6}{\left(n+7\right)\left(n+5\right)}\right)$
$\lim_{x\to0}\left(\frac{\left(1+x\right)^{\left(\frac{1}{x}\right)}-e}{x}\right)$
$\frac{1}{\cos\left(x\right)}-\frac{sec\left(x\right)}{1+\sin\left(x\right)}=\tan\left(x\right)$
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