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Maths Questions ^_^

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Mao:
so, you are given that:



that is,

if we represent this in a triangle:



the hypotenuse, by pythagoras's theorem, is

sine is opposite/hypotenuse, so



cosine is then




to find , we use the double angle formula:

dcc:

Odette:
OH I GET IT!! YAY!! THANK YOU MAO AND DCC ;D ;D ;D :D :D :D

Odette:
Ok new set of questions and new topic :D COMPLEX NUMBERS!! YAY
Here are some of the questions I need help with...
1.Let z = 4 + 8i  and = 8 + 6i. Evaluate each of the following, giving your answer in the form x + yi.
a) z 
b)z + 3 
c)
d)

2. Using z from the previous question, evaluate z, giving your answer in the form x + yi

Thanks again to whoever helps :)

Odette:
Oh and if anyone could possibly explain the concept of complex numbers that would be greatly appreciated, because the lecturer didn't explain it clearly and this is the first time i've been introduced to complex numbers.

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