If sin θ + cos θ = m and sec θ + cosec θ = n, then n (m+1) (m-1) is equal to
m
n
2m
2n
The value of Cos2 A ( 3-4 cos2 A)2 + sin2 A ( 3-4 sin2A)2 =
Cos 4 A
sin 4A
1
None of these
The value of cos 1o cos 2o cos 3o .... cos 100o =
-b
0
If sin A = 4/5 and cos B = -12/13, where A and B tie in first and third quadrant respectively, then cos (A + B) is equal to
The value of cos 15o is
The minimum value of 5 sin2θ + 4 cos2θ is
2
3
4
The value of sin 20o sin 40o sin 60o sin 80o is equal to
-3/16
5/16
3/16
-5/16
The maximum value 3 cos θ + 4 sin θ is
5
(tan 7o) (tan 23o) (tan 60o)(tan 67o)(tan83o) is
7
√3
If cos θ = 1/2 (x + 1/x), then 1/2 (x2 + 1/x2) is equal to
sin 2 θ
cos 2 θ
tan 2 θ
sec2 θ