1.

Which of the following is correct for any two complex number z_(1) and z_(2)?

Answer»

`|z_(1)z_(2)|=|z_(1)||z_(2)|`
`ARG(z_(1)z_(2))=arg(z_(1))*(z_(2))`
`|z_(1)+z_(2)|=|z_(1)|+|z_(2)|`
`|z_(1)+z_(2)|ge|z_(1)|+|z_(2)|`

ANSWER :A


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