A. nπ + (-1)n π/6
B. nπ + π/2
C. 2nπ + 3π/2
D. none
If sin x-3 sin 2x+sin 3x=cos x-3cos 2x+cos 3x then x=
If cos θ+cos 2θ+ cos 3θ=0 then θ=
If tan (π/2 sin θ) = cot (π/2 cos θ) then sin (θ+ π/4) =
If tan x+ tan 4x+tan 7x=tan x tan 4x tan 7x, then x=
If cos 2θ+cos 8θ= cos 5θ then θ=
If 2-cos3 θ=3 sin θ cos θ then θ=
The solution of sin 2θ+cos 2θ+sin θ+ cos θ+1=0 in the first quadrant is
The solution set of sec θ=2cos θ is
If tan2 θ=3 cosec2 θ-1 then θ=
The domain of Cos-1 (4x-9) is