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( z_ 1 ) এবং ( z_ 2 ) দুটি জটিল সংখ্যা হলে- i. ( quad left|z_ 1 -z_ 2 right| leq left|z_ 1 right|+ left|z_ 2 right| ) ii. ( quad arg left( frac z_ 1 z_ 2 right)= arg left(z_ 1 righ | Suva Ai