Given that cos xo = (frac{1}{r}), express tan x in terms of r
-
A.
(frac{1}{sqrt{r}}) -
B.
(sqrt{r}) -
C.
(sqrt{r^2 + 1}) -
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})