`(cosx)/cos(x-2y)=lambda=>tan(x-y)tany=`

(cos x )/( cos (x-2y))= lambda implies tan(x-y) tan y=

If (cosx)/(cos(x-2y))=lamda , then show that tan(x-y)=((1-lamda)/(1+lamda))coty .

Prove that: sin(x+y)/sin(x-y)=(tanx+tany)/(tanx-tany)

If cos x=lambda cos(x-2y) then value of (1-lambda)/(1+lambda)= A) tan(x-y)cot y B) cot(x-y)tan y C) tan(x-y)tan y D) 0

Show that cos^(-1) ((cosx+cos y)/(1+cos x.cosy))= 2tan^(-1)(tan(x/2).tan(y/2)) .

Prove that (sin(x+y))/(sin(x-y))=(tanx+tany)/(tanx-tany)

Prove that, (sin(x+y))/(sin(x-y))=(tanx+tany)/(tanx-tany)

Prove that (sin(x+y))/(sin(x-y))=(tanx+tany)/(tanx-tany)