A problem by OJAS JAIN

Level pending

If a=bc,b=cd,c=daa=b-c, b=c-d, c=d-a and abcd0abcd \neq 0, find the value of

ab+bc+cd+da. \frac{a}{b}+\frac{b}{c}+\frac{c}{d}+\frac{d}{a}.

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