Find the modulus and argument of the fol...

Find the modulus and argument of the following complex number and hence express them in the polar form: `sin 120^@-i\ cos 120^@`

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`sin 120^o-i cos 120^o`
`(sqrt3)//2`+ `i/2`
`r=|x|`
`=sqrt((3/4)+(1/4))`
...

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