Hello i have 3 exercices i finished them and i need the last questions

Write in trigonometrical form the complex numbers:

[1+itan(alfa)]^4

------------

[1-itan(alfa)]

it's one number but i don't know how to use maths letters here:p

Thanks

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- September 27th 2007, 06:06 AMiceman1complexe2
Hello i have 3 exercices i finished them and i need the last questions

Write in trigonometrical form the complex numbers:

[1+*i*tan(alfa)]^4

------------

[1-*i*tan(alfa)]

it's one number but i don't know how to use maths letters here:p

Thanks - September 27th 2007, 06:30 AMtopsquark
There is a "clever" way to start simplifying this, but let's just take things at face value here.

The first thing you want to do is to get rid of that "i" in the denominator:

Now expand the numerator using the binomial theorem (or if you are masochistic, expand it out term by term) and separate the real and imaginary parts.

-Dan - September 27th 2007, 06:41 AMPlato
Recall that so that .

- September 27th 2007, 08:56 AMPlato
This is a postscript, resulting from a PM.

It seems that the problem is actually .

In which case;

- September 27th 2007, 09:24 AMiceman1
:D Thanks :eek: