A book, which may be modelled as a particle of weight 8N rests in equilibrium on a desk top inclined at 28 degree to the horizontal. ind the frictional force acting on the book. he coefficients of friction between the book and the desk top is 0.6. Determine whether the equilibrium is limiting.

No clue

F = 8 sin (28)= 3.75

R= MF

= 0.3* 3.75

but the answer given is 3.76 N and the friction is not limiting . Please help me out