Complete the Identity $\cos \left( \tan ^ { - 1 } v \right) = ?$

question 368

Multiple Choice

Complete the identity.
- $\cos \left( \tan ^ { - 1 } v \right) = ?$

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

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