A particle is held in equilibrium by three coplanar forces of magnitudes    and  .

The angles between these forces are    and    as shown in the diagram below.
 

If  , then    is equal to

The diagram above shows a particle at in equilibrium in a plane under the action of three forces of magnitudes and .

Which one of the following statements is false?

A.  

B.  

C.  

D.  

E.