for any two complex no. z1 and z2 prove that re(z1 z2) = re(z1) * re(z2) - im(z1) * im(z2)

my incomplete soln-

don't have any idea about it.

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- May 29th 2011, 04:52 AMsaha.subhamcomplex number
for any two complex no. z1 and z2 prove that re(z1 z2) = re(z1) * re(z2) - im(z1) * im(z2)

my incomplete soln-

don't have any idea about it. - May 29th 2011, 05:02 AMAlso sprach Zarathustra
- May 29th 2011, 05:13 AMProve It

So what is the real part of ? - May 29th 2011, 07:04 AMsaha.subham
- May 29th 2011, 07:11 AMProve It
You can write any complex number as , where is the real part of and is the imaginary part of .

You have . If you're going to rewrite this as , what is (the real part of )? - May 29th 2011, 09:51 PMsaha.subham
- May 29th 2011, 11:00 PMProve It
Because is the real part of , is the real part of , is the imaginary part of and is the imaginary part of .

- May 30th 2011, 03:54 AMsaha.subham
- May 30th 2011, 04:13 AMProve It
You DON'T. You are asked merely to state the REAL part of , in other words, everything that's not attached to an .