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Let z(1)=2-3i and z(2)=5+12i, verify tha...

Let `z_(1)=2-3i and z_(2)=5+12i`, verify that:
(i) `|z_(1)+z_(2)|lt|z_(1)|+|z_(2)|`
(ii) `|z_(2)-z_(1)|gt|z_(2)|-|z_(1)|`

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