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October 20, 2014

October 20, 2014

Posted by **fred** on Wednesday, August 17, 2011 at 9:57pm.

- trig -
**Reiny**, Wednesday, August 17, 2011 at 10:10pmwe know cos 5π/6 = =√3/2 and sin 5π/6 = 1/2

so

4(cos 5Pie/6 + i sin 5 pie/6)

= 4(-√3/2 + i(1/2) )

= -2√3 + 2i

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