1.If x+1x=2cosαx + \frac{1}{x} = 2 \cos \alphax+x1=2cosα, then xn+1xnx^n + \frac{1}{x^n}xn+xn1 is equal toa.2ncosα2^n \cos \alpha2ncosαb.2ncosnα2^n \cos n\alpha2ncosnαc.2isinnα2i \sin n\alpha2isinnαd.2cosnα2 \cos n\alpha2cosnαLogin to continueOnly logged in users canattempt or see the solution.
