# FCP2 Complex numbers

#1
For questions like the following, how do you know whether to work it out using the binomial expansion method or using results like z+1/z = 2 cos theta? Thanks.
Last edited by Htx_x346; 5 months ago
0
5 months ago
#2
(Original post by Htx_x346)
For questions like the following, how do you know whether to work it out using the binomial expansion method or using results like z+1/z = 2 cos theta? Thanks.
For ones in that form {sin(ntheta)=...} you use the regular binomial expansion method and when you have a trig function with a power you use the z+(1/z)
1
#3
(Original post by Quarsient)
For ones in that form {sin(ntheta)=...} you use the regular binomial expansion method and when you have a trig function with a power you use the z+(1/z)
thanks so much!!
0
5 months ago
#4
(Original post by Htx_x346)
thanks so much!!
np
0
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