$7-9\cdot2+2\cdot4$
$\frac{\cos\:\left(x\right)+\cos\:^2\left(x\right)}{1+\cos\:\left(x\right)}\:=\:cos\:x$
$\lim_{x\to0}\left(\frac{sin\left(9x\right)}{\left(x+8\right)^3}\right)$
$uzu$
$\left(3+x\right)^2=9+x^2+8x$
$\frac{-7}{2}.\frac{2}{1}$
$=\left(2-1\right)\left(8-1\right)$
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