" 28.If "x+(1)/(x)=2cos alpha," then "x^(n)+(1)/(x^(n))=

If x+(1)/(x)=2cos theta, then the value of x^(n)+(1)/(x^(n))

If x+1/x=2cos theta,"Show that"x^n+1/x^n=2cos n theta

If 2 cos alpha = x + (1)/(x) and 2 cos beta = y + (1)/(y) , show that x^(m) y^(n) + (1)/(x^(m)y^(n)) = 2 cos (m alpha + n beta)

Find 1/x+x=2cos theta, then prove that x^(n)+1/x^(n)=2cos n theta

2cos theta=x+(1)/(x) and 2cos phi=y+(1)/(y) then (A)x^(n)+(1)/(x^(n))=2cos(n theta)n in Z(B)(x)/(y)+(y)/(x)=2cos(theta-phi)(C)xy+(1)/(Xy)=2cos(theta+phi)(D)x^(m)y^(n)+(1)/(x^(m)y^(n))=2(cos m theta+n phi),m,n in Z

If x satisfies x^(2)-2x cos theta +1=0 , then the value of x^(n)+((1)/(x^n)) is

If 2 cos alpha = x + (1)/(x) and 2 cos beta = y + (1)/(y) , show that (x^(m))/(y^(n))- (y^(n))/(x^(m))= 2i sin (m alpha - n beta)

If x + 1/x = 2cos theta , then for any integer n, x^(n) + 1/x^(n) =

If f(x)=alpha x^(n), prove that alpha=(f'(1))/(n)