"Compute Arg(1+2i) x Arg(2+3i)"

So:

I keep getting -60 degrees, but it should be something like 100 degrees. What am I doing wrong?

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- Apr 3rd 2009, 06:21 PMcoasterguyArgument of complex number
"Compute Arg(1+2i) x Arg(2+3i)"

So:

I keep getting -60 degrees, but it should be something like 100 degrees. What am I doing wrong? - Apr 3rd 2009, 07:06 PMmr fantastic
-4 + 7i lies in the second quadrant. So you want the angle lying in the second quadrant such that . It is not a 'special angle' so you will have to use your calculator and get a decimal approximation.

But this is not the answer to the question as posted. The answer to the question you've posted is .