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if (1+i x/a) (1+i x/b)(1+i x/c)…=A+iB th...

if `(1+i x/a) (1+i x/b)(1+i x/c)…=A+iB` then prove that `(1+ x^2/a^2)(1+x^2/b^2)(1+x^2/c^2)…=A^2+B^2 `

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