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Mathematics 17 Online
OpenStudy (abbles):

Check my answer please :)

OpenStudy (abbles):

zepdrix (zepdrix):

\[\large\rm 3cis\frac{\pi}{15},\qquad\qquad 3cis\frac{11\pi}{15},\qquad\qquad 3cis\frac{21\pi}{15}\]Yes good job!

zepdrix (zepdrix):

cis is short for cos+i sin just in case you haven't seen that before.

OpenStudy (abbles):

Ooh, haven't seen that before! Is it commonly used?

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