question_answer

Which of the following expressions represents Lami's theorem, if A, B, C are three are in equilibrium and as shown in figure.

A)  \[\frac{A}{\cos \alpha }=\frac{B}{\cos \beta }=\frac{C}{\cos \gamma }\]

B)  \[\frac{A}{\sin \alpha }=\frac{B}{\sin \beta }=\frac{C}{\sin \gamma }\]

C)  \[\frac{A}{{{\cos }^{2}}\alpha }=\frac{B}{{{\cos }^{2}}\beta }=\frac{C}{{{\cos }^{2}}\gamma }\]                     

D)  None of these