Write the Following as an Algebraic Expression in U, U $\cos ( \arctan u )$

question 304

Multiple Choice

Write the following as an algebraic expression in u, u > 0.
- $\cos ( \arctan u )$

• A) \(\mathrm { u } \sqrt { \mathrm { u } ^ { 2 } + 1 }\)
• B) \(\frac { u \sqrt { u ^ { 2 } + 1 } } { u ^ { 2 } + 1 }\)
• C) \(\frac { \sqrt { u ^ { 2 } - 1 } } { u ^ { 2 } - 1 }\)
• D) \(\frac { \sqrt { u ^ { 2 } + 1 } } { u ^ { 2 } + 1 }\)

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