$\frac{3}{3}\cdot\frac{x}{3}$
$\frac{tana}{seca+1}+\frac{tana}{seca-1}=\:2coseca$
$\left(7a^4b^3+c^7\right)\left(7a^7b^3-c^7\right)$
$\left(x+y+z\right)+\left(2x+2z\right)$
$\lim_{x\to1}\left(\frac{x^{11}-1}{x^{28}-1}\right)$
$26.50-13.50$
$9.5\:.\:5.5$
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