The maximum value of Sinθ Cosθ is
1
0
-1/2
1/2
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 sin 20^{o} sin 40^{o} sin 60^{o} sin 80^{o} is equal to
^{-3}/_{16}
^{5}/_{16}
^{3}/_{16}
^{-5}/_{16}
The maximum value 3 cos θ + 4 sin θ is
3
4
5
None of these
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
If cos θ = ^{1}/_{2} (x + ^{1}/_{x}), then ^{1}/_{2} (x^{2} + ^{1}/_{x}^{2}) is equal to
sin 2 θ
cos 2 θ
tan 2 θ
sec2 θ
-1
If sin θ + cosec θ = 2, then sin^{2} θ + cosec^{2} θ is equal to
2
6
The minimum value of 5 sin^{2}θ + 4 cos^{2}θ is
The value of sin A sin (60^{o}-A) sin (60^{o} +A) is equal to
Sin 3 A