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Which one of the following function cont...

Which one of the following function contains only one integer in its range ?
[ Note sgn (k) denotes the signum function of k.]

A

a. `f(x) = 1/2 cos^(-1) ((1-x^(2))/(1+x^(2)))`

B

b. `g(x) = sgn (x + 1/x)`

C

c. `h(x) = sin^(2) x + 2 sin x + 2`

D

d. ` k(x) = cos^(-1) ( x^(2) - 2x + 2)`

Text Solution

Verified by Experts

The correct Answer is:
D
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