The required inverse trigonometric function is tan^-1(x°). Hence option b is correct.
What are functions?
Functions is the relationship between sets of values.
Here,
Inverse function is represented by f^-1(x).
As from above expression the only function that has inverse trigonometric function is tan^-1(x°). From the optoins.
Thus, the required inverse trigonometric function is tan^-1(x°).
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