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19 votes
19 votes
Explain please .................

Explain please .................-example-1
User Peter Trenery
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1 Answer

13 votes
13 votes

Answer:

See below

Explanation:

cos 2pi/3 = -1/2

sin 2pi/3 = sqrt (3)/2

cos 1 pi/6 = sqrt(3)/2

sin 11 pi/6 = - 1/2

so when you put in these values in you will have :

(2*8) * (-1/2 + sqrt (3)/2 i )( sqrt(3)/2) + i (-1/2) )

= 16 ( - sqrt (3)4 + 1/4 i + 3/4 i - sqrt(3)/4 i^2 ) rememember i^2 = - 1

= 16 ( 1/4 i + 3/4 i )

= 16 i

User Matthew Gilliard
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