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( z_ 1 =x_ 1 +i y_ 1 , z_ 2 =x_ 2 +i y_ 2 ) দুইটি জটিল সংখ্যা হলে- i. ( left|z_ 1 +z_ 2 right| leq left|z_ 1 right|+ left|z_ 2 right| ) ii. ( left|z_ 1 +z_ 2 right| leq left|z_ 1 r | Suva Ai