If `(" cos " (A+B))/(" cos " (A-B)) =(" sin " (C+D))/(" sin " (C -D)) ,` prove that tan A tan B tan C + tan D=0

If ( cos (A+B))/( cos (A-B)) =( sin (C+D))/( sin (C -D)) then prove that tan A tan B tan C + tan D=0 ................. A) 0 B) -1 C) sqrt3 D) 1

If (cos (AB)) / (cos (A + B)) + (cos (C + D)) / (cos (CD)) = 0 Prove that tan A tan B tan C tan D = -1

If cos (A + B) sin (C- D) = cos (A- B) sin (C+D) , show that : tan A tan B tanC + tanD=0 .

If (cos(A-B))/(cos(A+B))+(cos(C+D))/(cos(C-D))=0, prove tht tan A tan B tan C tan D=-1

If cos(A+B) sin (C-D) = cos (A-B) sin (C+D) , then show that tan A tan B tan C + tan D =0

If cos(A+B) sin (C-D) = cos (A-B) sin (C+D) , then show that tan A tan B tan C + tan D =0

(cos (AB)) / (cos (A + B)) + (cos (C + D)) / (cos (CD)) = 0rArr tan A tan B tan C tan D =

If cos 2 A sin 2 B= cos 2 C sin 2D , prove that tan (C+A) tan (C-A) tan (B+D)= tan (D-B)