If Z(1)" and "Z(2) are any two complex n...

If `Z_(1)" and "Z_(2)` are any two complex numbers, then which one of the followoing is true?

`|Z_(1)+Z_(2)|=|Z_1|+|Z_2|`

`|Z_(1)-Z_(2)|=|Z_1|-|Z_2|`

`|Z_(1)+Z_(2)|le|Z_1|+|Z_2|`

`|Z_(1)-Z_(2)|le|Z_1|-|Z_2|`

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