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 cot (45o + θ) cot (45o - θ) is:
-1
0
1
∞
The value of cos 15o is
If sin (∝ - β) = 1/2 and cos (∝ + β) = 1/2, where ∝ and β are positive acute angles, then:
∝ = 45o
β= 15o
∝= 15o, β = 45o
∝ = 60o, β = 15o
The maximum value of Sinθ Cosθ is
-1/2
1/2
If sin θ + cosec θ = 2, then sin2 θ + cosec2 θ is equal to
2
4
6
The value of sin A sin (60o-A) sin (60o +A) is equal to
Sin 3 A
None of these
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 maximum value 3 cos θ + 4 sin θ is
3
5
The minimum value of 5 sin2θ + 4 cos2θ is