what is the proof of m-n theorom?plz sir send it fast ….................’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’

m-n theorem

If D be the point on the side BC of a triangle ABC which divides the side BC in the ratio m: n, then with respect to the figure given below, we have:

(m + n) cot θ = m cot α – n cot ß.

(m + n) cot θ = n cot B – m cot C.