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 Please help

 Mar 2, 2019
 #1
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+2

z =  8( cos20 + isin 20)

w = 4 (cos60 + isin 60)

 

z * w =

 

32   (  [ cos20cos60 + [sin 20cos60] i  + [ sin 60cos20 ] i  +  [ sin 20 sin 60 ] i^2     )  =

 

32  ( [ cos20cos60 ] + [sin 20cos60] i  + [ sin 60cos20 ] i  -  [ sin 20 sin 60 ]    )  =

 

32    (   [  cos20cos60 - sin 20sin 60]  +  [ sin20cos 60 + sin60cos20] i    )   =

 

32 (   cos ( 20 + 60) + sin (20 + 60)  i  )  =

 

32 ( cos (80)     +  i sin ( 80)  )

 

 

cool cool cool

 Mar 2, 2019

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