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A.
\(\frac{1}{\sqrt{r}}\)
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B.
\(\sqrt{r}\)
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C.
\(\sqrt{r^2 + 1}\)
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D.
\(\sqrt{r^2 - 1}\)
Correct Answer: Option D
Explanation
cos xo = \(\frac{1}{r}\); \(\sqrt{r^2 - 1}\)
By Pythagoras r2 = 12 + x2 - 1
x = \(\sqrt{r^2 - 1}\)
tan xo = \(\sqrt{r^2 - 1}\)
= \(\sqrt{r^2 - 1}\)
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