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A triangle ABC forces acting along lA, lB and lC, respectively, in equilibrium, where l is the incentre of ABC. Then, is

 
cos A : cos B : cos C
cos : cos : cos
sin : sin : sin
sin A : sin B : sin C

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What rubbish

Soln please

ABC is a triangle, Forces acting along lA, lB and lC respectively are in equilibrium where l is the incentre of ABC. Then is :1. cosA : cos B : cos C 2. cos : cos : cos 3. sin : sin : sin 4. sin A : sin B : sin C