If y=tan−1[√1+x3+√1−x3√1+x3−√1−x3], then y′ at x=0 is
If (x+1x)=4, find the value of
(1) (x3+1x3)
(2) (x−1x)
(3) (x3−1x3)
If x=3√2+√3, then x3+1x3=
If x=2+√3, then x3+1x3 = __.