$\lim_{x\to\frac{\pi}{2}}\left(4\cos\left(3x\right)\sec\left(5x\right)\right)$
$b^2-30b+36$
$\tan\left(\frac{a}{4}\right)+1=2$
$+4-2+7-5+1$
$\frac{1-\sin\:\left(x\right)}{\cos\:\left(x\right)}=\frac{\cos\:\left(x\right)}{1-\sin\:\left(x\right)}$
$\frac{-5}{0}$
$\lim_{x\to0}\frac{x-sinx}{tgx-sinx}$
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