Which integral correctly computes the length of the curve y=In(cos(x)) between x=0 and x=?/3 ?a) ?/3 ??tan(x) dxb) ?/3 ??2?ln(cos(x))?(1+tan²(x)) dxc) ?/3 ??sec(x) dxd)?/3 ???(1 + (In(cos(x)))² )dx