" If "(x^(2)+1)/(2x)=cos A," then "(x^(6)+1)/(2x^(3))=...

If (x^2+1)/(2x)=cos theta then (x^6+1)/(2x^3)=

If: (1-cos2x)/(1+cos 2x)=3, then: x=

If: (1- cos 2x)/(1+ cos 2x)=3 , then: x =

At x=0,f(x)=cos x-1+(x^(2))/(2)-(x^(3))/(6)

If 2 cos theta = x + (1)/(x), prove that 2 cos 3 theta = x ^(3) + (1)/(x ^(3)).

3 sin ^(-1 ) ""(2x )/(1+x^(2))-4cos^(-1) ""(1-x^(2))/(1+x^(2))+2tan ^(-1)""(2x )/(1-x^(2))=(pi)/(3)

x=(6-sqrt(32))/(2) thenfindthevalueof (x^(3)+(1)/(x^(3)))-6(x^(2)+(1)/(x^(2)))+(x+(1)/(x))

If x^(4) - 3x^(2) - 1 = 0 , then the value of (x^(6)-3x^(2)+(3)/(x^(2))-(1)/(x^(6))+1) is :

3 sin ^(-1)((2 x)/(1+x^(2)))-4 cos ^(-1)((1-x^(2))/(1+x^(2))) +2 tan ^(-1)((2 x)/(1-x^(2)))=(pi)/(3) ( then ) x=