Dear sir,
i would be glad if someone can help me in the below problem
thanks
Find the coefficient of x to the power of n in the expansion of
cos 2x.
People have. You have refused to do what you have been asked. You say you can get this "to the power of n but not 2n" but your original problem says nothing about a power of 2n. Do you mean you could find the coefficient of x^n if the problem were to expand cos(x) rather than cos(2x)?
(Around, I assume, x= 0. You still haven't answered the very first question asked of you.)
If so, please show us what you would get if this were cos(x) rather than cos(2x).