Express and in terms of and .

Use your results to prove that:

I have done:

and

and

The proving part:

I'm stuck with the part. The power of 2 indicates its real, but I haven't figured out how to express it in terms of .

Thanks!

- Sep 28th 2010, 09:03 PMarzeProving trig identity with exponential form of complex numbers
Express and in terms of and .

Use your results to prove that:

I have done:

and

and

The proving part:

I'm stuck with the part. The power of 2 indicates its real, but I haven't figured out how to express it in terms of .

Thanks! - Sep 28th 2010, 09:07 PMProve It
You should know that

and .

Then

.

Thus .

.

Thus

.

Now try to go from here...