Two Sides of a Right Triangle ABC (C Is the Right

Multiple Choice

Two sides of a right triangle ABC (C is the right angle) are given. Find the indicated trigonometric function of the given
angle. Give exact answers with rational denominators.
-Find $\sec B$ when $a = 9$ and $b = 5$ .

A) $\frac { 9 \sqrt { 106 } } { 106 }$
B) $\frac { \sqrt { 106 } } { 9 }$
C) $\frac { 9 \sqrt { 106 } } { 5 }$
D) $\frac { 5 \sqrt { 106 } } { 106 }$