√2 - 1
π/4
3π/4
None of these
sin-1(sin5π/6)=_____________
5π/6
2π/6
3π/6
π/6
Let f(x)= sec-1x + tan-1x. Then f(x) is real for
x∈[-1,1]
x∈R
x∈ (-∝,-1) ∪(1, +∝)
π/2
-π
π
-π/2
If Sin-1 x = π/5 for some x∈ [-1, 1] then the value of Cos-1 x is
3π/10
5π/10
7π/10
9π/10
1/x+ 1/y+1/z
xyz
xy+yz+zx
π/3
is equal to ______.
tan -1 xy
tan-1 x/y
tan -1 y/x
Cos (tan-1x) =
-1/√(1 + x2)
1/√(1 + x2)
1/√(1 - x2)
-1/√(1 - x2)
