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If (1+i)(1+2i)(1+3i)1+m)=(x+i y) , then ...

If `(1+i)(1+2i)(1+3i)1+m)=(x+i y)` , then show that `2xx5xx10xxxx(1+n^2)=x^2+y^2dot`

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To solve the given problem, we need to show that if \[ (1+i)(1+2i)(1+3i)\cdots(1+mi) = x + iy, \] then ...
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