Friday
December 19, 2014

Homework Help: Maths

Posted by TP on Wednesday, March 4, 2009 at 2:44am.

Could someone help me with this question

Write in polar form : sinx - i cosx

I've come up to this point, and it's wrong, can't someone please help?

=sin(pie/2-x)-icos(pie/2-x)
=cosx-isinx
=cis(-x)

But the answer is cis(x-pie/2)

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