$\lim_{x\to-1}\left(\frac{5-\sqrt{3x+20}}{x+1}\right)$
$\left(5-6x\right)\left(5+6x\right)$
$2sin\theta\:\:tan\theta\:=4cos\theta\:-1$
$x^5-x^4+x$
$\sqrt{x^2-3x+2}+\frac{1}{\sqrt{3+2x-x^2}}$
$y2-26y+169$
$\left(2\:n\:b\:7\right)^2$
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