Hi, got TWO questions in my FP2 book, but couldnt find the way to solve it.
For the first one,i cant prove it. i have no idea what kind of mistakes that i made. The following is my working
For the second one, i can do part a and b by myself, but i dun know how to do part c by using the answer in part b.
FP2 Further Complex Numbers
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for second question write tan theta =x in rhs. now ignoring lhs what does rhs need to equal to match the x^4... equation?
for first question you need to use
which follows from the following with n=1
giving z^(n)+z^(-n)=2cos nx
and the above will help when you exapnd (z+1/z)^n
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