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# how to do complex calculation?

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how to do complex calculation?invoving Iota and phase eg: phase of 4+9i

Guest Nov 21, 2014

#1
+94087
+5

The 1.1526 is correct to  4 decimal places.

So the phase of this complex number is the angle       $$tan^{-1}\left(\frac{9}{4}\right)\;\approx\; 1.1526$$

My knowledge of complex numbers is very rusty but I think all of this is correct.

Melody  Nov 21, 2014
#1
+94087
+5

The 1.1526 is correct to  4 decimal places.

So the phase of this complex number is the angle       $$tan^{-1}\left(\frac{9}{4}\right)\;\approx\; 1.1526$$

My knowledge of complex numbers is very rusty but I think all of this is correct.

Melody  Nov 21, 2014