$\int\frac{5x-14}{x^2-5x+4}dx$
$25\left(6-x\right)^{-1}=x+4$
$\frac{\sin^2x}{\cos^2x}+1=\csc^2x$
$\log\frac{6x}{x^2-3}$
$\int3z\cdot\cos\left(-z\right)dx$
$\lim_{x\to1}\left(\frac{\sqrt{x}-1}{\sqrt{x+3}-\sqrt{5-x}}\right)$
$\ln\frac{3}{x}\:=2$
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