\(\)\(\dfrac{a}{b}=\dfrac{c}{d} \rightarrow ad=bc\)
\(\rightarrow a= \dfrac{bc}{d} \) \(b = \dfrac{ad}{c}\)
\(\dfrac{a}{c}=\dfrac{b}{d} \); \(\dfrac{d}{b}=\dfrac{c}{a} \); \(\dfrac{d}{c}=\dfrac{b}{a} \)
\(\dfrac{a\pm b}{b}=\dfrac{c\pm d}{d} \);
\(\dfrac{a+b}{a-b}=\dfrac{c+d}{c-d} \); \(\dfrac{a \pm b}{a}=\dfrac{c\pm d}{c} \);
\(\dfrac{a}{a \pm b}=\dfrac{c}{c \pm d} \); \(\dfrac{b}{a \pm b}=\dfrac{d}{c \pm d} \)
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