Write an Algebraic Expression That Is Equivalent To $\sin \left( \arctan \frac { x } { 9 } \right)$

question 20

Multiple Choice

Write an algebraic expression that is equivalent to $\sin \left( \arctan \frac { x } { 9 } \right)$ .

• A) \(\frac { 9 } { \sqrt { x ^ { 2 } + 81 } }\)
• B) \(\frac { 9 } { x }\)
• C) \(\frac { \sqrt { x ^ { 2 } + 81 } } { x }\)
• D) \(\frac { \sqrt { x ^ { 2 } + 81 } } { 9 }\)
• E) \(\frac { x } { \sqrt { x ^ { 2 } + 81 } }\)

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