The principal of value of sin-1(sin 3π/4) is
5π/4
3π/4
π/4
-π/4
If sin-1x = π/5, then cos-1x equals
π/10
3π/10
7π/4
If 2 tan-1 (cos x) = tan-1 (2 cosec x), then value of x is
π/3
None of these
cos-1 (cos x) = x is satisfied by
x R
x [0, π]
x [-1, 1]
Tha value of cot-121 + cot-113 + cot-1(-8) is
0
cot-126
cot-11
The value of sin (2 sin-1 0.8) is
0.96
0.48
0.64
If x = sin-1 k, y = cos-1 k, -1 ≤ k ≤ 1, then the correct relationship is
x + y = 2
x - y = 2
x + y = π/2
x - y = π/2
sin [2 cos-1 (-3/5)] is equal to
6/25
24/25
4/5
-24/25
If tan-1x + tan-1y + tan-1z = π, then x + y + z =
xyz
1
2xyz
tan-1 (1/4) + tan-1 (2/9) =
1/2 cos-1(3/5)
1/2 sin-1 (3/5)
1/2 tan-1 (3/5)
tan-1 (1/2)
