min and max arg of complex number. lz-4il=1

Sonal7

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I did this try this Q but i think what to do next. I have figured the 3rd side using pythag.20201226_112537 (2).jpg
 

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as the long side is sqrt 15. arctan [MATH]\alpha[/MATH]=[MATH]\sqrt 15[/MATH][MATH]\theta[/MATH]=90-[MATH]\gamma[/MATH]so the two are equivalent.
 

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