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Find the principal argument of (1+isqrt(...

Find the principal argument of `(1+isqrt(3))^2dot`

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Given that , `z= (1+isqrt(3))^(2)`
`rArr z= 1-3 +2isqrt(3) rArr z=-2+i2sqrt(3)`
`rArr tan alpha=|(2sqrt3)/(-2)|=|-sqrt(3)|=sqrt(3) " " [:' tan alpha = |(Im(z))/(Re(z))|]`
`rArr tan alpha = "tan"(pi)/(3) rArr alpha = (pi)/(3)`
`:' Re (z)lt0 "andIm(z)gt0`
`rArr arg(z)= pi-(pi)/(3) rArr = (2pi)/(3)`
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