A. sinθ=√5/12
B. cosθ= √5/12
C. sinθ= 3/4
D. cosθ= 3/8
If a. cos (θ+ α)= b cos (θ-α), then (a+b) tan θ=
If α,β are solutions of a cos 2θ+b sin 2θ=c, then tan α tan β=
If sin A= sin2 B and 2 cos2 A =3 cos2 B, then the ΔABC is
In ΔABC, if A=900 then r2 +r3 =