$\frac{sin\:3x\:-\:sin\:x}{cos\:3\:x\:-\:cos\:x}=\:-cot\:2x$
$\frac{\cos\left(x\right)-\sin\left(x\right)^2}{\sin\left(x\right)}$
$\:7x\:-\:210\:=\:14\:$
$\lim_{x\to0}\frac{x^2-\:x}{\sqrt{x+4}\:-\:2\:}$
$\frac{a^6}{a^2}$
$x-2y+3z=1$
$\frac{36\cdot xy^4}{20xy^2}$
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