A અહી $(a+ib)(c+id)(e+if)(g+ih)=A+iB...........(1)$ અને જો $(a-ib)(c-id)(e-if)(g-ih)=A-iB.............(2)$ ગુણાકાર કરતા $\therefore (a+ib)(a-ib)(c+id)(c-id)(e+if)(e-if)(g+ih)(g-ih)=(A+iB)(A-iB)\\ \therefore (a^2+b^2)(c^2+d^2)(e^2+f^2)(g^2+h^2)=A^2+B^2$
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