Evaluate the Quantity Without Using a Calculator or Tables $\cos \left( \arctan \frac { 1 } { \sqrt { 3 } } \right)$

question 11

Multiple Choice

Evaluate the quantity without using a calculator or tables. $\cos \left( \arctan \frac { 1 } { \sqrt { 3 } } \right)$

• A) 1/2
• B) \(\frac { \sqrt { 3 } } { 2 }\)
• C) \(- \frac { \sqrt { 3 } } { 2 }\)
• D) -1/2
• E) \(\frac { \sqrt { 3 } } { 3 }\)

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