1 - cos2θ - sin2θ = ___________
1
2
0
3
Cos4 A- sin4A=
(cos2A-sin2A)2
(cos2A+ sin2A)
1-2 sin2A
1-2 cos2A
If θ =π/4, then 1+ tan 2 θ =
sin 2 θ
cot 2 θ
cosec2 θ
sec 2 θ
If sin θ + cos θ =1 , the general value of θ is
2 n π
n π + (-1)n π/4 - π/4
2 n π+ π/2
n π+ π/2
If cos θ = -5/12 in which quadrant does θ lie ?
I quadrant
II quadrant
III quadrant
II or III
sin θ
-sin θ
cos θ
- cos θ
The general solution of sinx - 3 sin 2x+ sin 3x= cosx -3 cos2x + cos 3 x is
n π+ π/8
n π/2+ π/8
(-1)n(nπ/2)+π/8
2nπ+cos-1 (3/2)
If sec2 θ = 4/3, the general value of θ is
2 n π ± π/6
n π ± π/6
2 n π ± π/3
n π ± π/3
Sinθ*cosecθ = ____________
180
none
If sin2 θ= 1/4, the general value of
2 n π ± (-1)n π/6
n π/2 ± (-1)'' π/6
n π± π/6
