यदि (a1 + i b(1)) (a(2)+i b(2)) = A+ B ...

यदि `(a_1 + i b_(1)) (a_(2)+i b_(2)) = A+ B ` है तो निम्नलिखित प्रत्येक को सिद्ध कीजिए:
`tan^(-1)""b_1/a_1+tan^(-1)""b_2/a_2 = tan^(-1)""B/A`

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