$\lim_{x\to0}\left(\frac{1+\sqrt{x+1}}{x}\right)$
$\frac{5x+21}{-4}>1$
$y^2=4tx$
$\lim_{x\to0}\left(\frac{10x^2}{cos\left(x\right)-1}\right)$
$\frac{sinxcosy-cosxsiny}{cosxsiny}$
$\left(10-5\right)\times\left(5+5\right)$
$\int1-13xdx$
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