If f : R R is defined by f(x) = lxl, then
f-1(x) = - x
f-1 =
the function f-1(x) does not exist
C.
the function f-1(x) does not exist
OA and OB are two roads enclosmng an angle of 120°. X and Y start from 'O' at the same time. X travels along OA with a speed of 4 km/h and Y travels along OB with a speed of 3 km/h.The rate at which the shortest distance between X and Y is increasing after 1 h is
37 km/h
13 km/h