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Mathematics 14 Online
OpenStudy (anonymous):

4cis(7pi/6)-3cis(pi/3) I'm not understanding how to solve.

OpenStudy (freckles):

You can't solve . May Be simplify. Also what is the abbreviation cis stand for

OpenStudy (anonymous):

I don't know, it's how the problem was worded.

hero (hero):

4cos(7pi/6)-3cos(pi/3)

OpenStudy (anonymous):

And it's multiplication not subtraction read it wrong.

hero (hero):

4cos(7pi/6)3cos(pi/3)

hero (hero):

Simplify cos(7pi/6) cos(pi/3)

OpenStudy (anonymous):

-12i

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