tan((A)/(2))=(3)/(2),quad (1+cos A)/(1-cos A)

If tan ""A/2 =3/2, then (1+ cos A)/(1- cos A)=

If tan ""A/2 =3/2, then (1+ cos A)/(1- cos A)= ................ A) -5 B) 5 C) 9/4 D) 4/9

tan(A/2)=(sqrt((1-cos A)/(1+cos A)))

show that, tan^(-1) ((1)/(sqrt(3)) tan ""(x)/(2))=(1)/(2) cos^(-1) ""((1+2 cos x)/(2+ cos x)).

tan^(-1)((1)/(sqrt(3))(tan x)/(2))=(1)/(2)cos^(-1)((1+2cos x)/(2+cos x))

1.What is the value of tan[(1)/(2)cos^(-1)((3)/(5))]+tan[(1)/(2)cos^(-1)((4)/(5))] ?

tan A=(1)/(2),tan B=(1)/(3), then cos2A is

prove that tan ((pi) / (4) + (1) / (2) cos ^ (- 1) ((a) / (b))) + tan ((pi) / (4) - (1) / (2) cos ^ (- 1) ((a) / (b))) = (b) / (a) cos ^ (- 1) ((cos x + cos y) / (1 + cos x cos y) ) = 2tan ^ (- 1) ((tan x) / (2) (tan y) / (2))

Prove that : (1)/(2) cos^(-1) ((1+ 2 cos x)/( 2+cosx) ) = tan^(-1) ((1)/(sqrt(3)) "tan" (x)/(2))