x=7+4sqrt(3)sec(x)=1cos(1)/(x^(3))+(1)/(y^(3))=?

co sec^(-1)((1)/(3x-4x^(3)))

x=7-4sqrt(3), then (x^(3)+(1)/(x^(3))) equals to

if x=sqrt(7+4sqrt(3)) then x+(1)/(x)

int_(-(1)/(sqrt(3)))^(-(1)/(sqrt(3)))(x^(4))/(1-x^(4))cos^(-1)((2x)/(1+x^(2)))dx

The value of f(x,y)=((x^(3)y)^((1)/(4))-(y^(3)x)^((1)/(4)))/(sqrt(y)-sqrt(x))+(1+sqrt(xy))/((xy)^((1)/(4)))xx((1+2sqrt((y)/(x))+(y)/(x))^(4) when x=9 and y=0.04

Prove that: 3cos^(-1)x=cos^(-1)(4x^(3)-3x),x in[(1)/(2),1]

Prove that 3cos^(-1)x=cos^(-1)(4x^(3)-3x),x in[(1)/(2),1]

If x=sqrt(7+4sqrt(3)), then x+(1)/(x)=