Use an Inverse Trigonometric Function to Write θ as a Function

Multiple Choice

Use an inverse trigonometric function to write θ as a function of x.​ ​ a = 5x
B = x + 9
​

A) $\theta = \arctan \frac { x + 9 } { 5 x }$
B) $\theta = \arcsin \frac { x + 9 } { 5 x }$
C) $\theta = \operatorname { arcsec } \frac { x + 9 } { 5 x }$
D) $\theta = \operatorname { arccsc } \frac { x + 9 } { 5 x }$
E) $\theta = \arccos \frac { x + 9 } { 5 x }$