Problem 715

Find   z*w . Leave your answer in simplified polar form. Express all angles in degrees rounded to the nearest tenth.

 

Solution:-

 

z * w =2(cos140+i sin 140) * 7(cos65+ isin 65 )

=(2*7)(cos(140+65)+isin(140+65))

= 14(cos205 + isin205)

 

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