1/x+ 1/y+1/z
xyz
xy+yz+zx
None of these
If u = xy, then ∂u/∂x =
yxy-1
u log x
u log y
xyx-1
Sin-1 (cos (sin-1x )) + cos -1 (sin (cos -1 x )) is equal to ________.
π/4
π/2
3π/4
0
If tan -1 ( x + 1 ) + tan -1 ( x -1 ) = tan -1 ( 8/31 ), then x is equal to ________.
1/2
-1/2
1/4
1
x/2
2x
3x
x
Cos (tan-1x) =
-1/√(1 + x2)
1/√(1 + x2)
1/√(1 - x2)
-1/√(1 - x2)
Sin (Sec-1 25/7) =
24/25
28/25
26/25
22/25
Tan ( cos -1 x ) is equal to ___________.
-π
π
-π/2
