If x1,x2,x3 are positive roots of x3−6x2+3px−2p=0(p∈R), then the value of sin−1(1x1+1x2)+cos−1(1x2+1x3)−tan−1(1x3+1x1) is equal to
If x1,x2,x3,x4 are four positive real numbers such that x1+1x2=4, x2+1x3=1, x3+1x4=4 and x4+1x1=1, then