Find the Exact Value by Using a Half-Angle Identity $\cos x$

question 244

Multiple Choice

Find the exact value by using a half-angle identity.
-Write $\cos x$ in terms of $\cot x$ .

• A) \(\frac { \pm \sqrt { \cot ^ { 2 } x + 1 } } { \cot x }\)
• B) \(\frac { \pm \cot x \sqrt { \cot ^ { 2 } x + 1 } } { \cot ^ { 2 } x + 1 }\)
• C) \(\frac { \pm \sqrt { \cot ^ { 2 } x + 1 } } { \cot ^ { 2 } x + 1 }\)
• D) \(\pm \sqrt { \cot ^ { 2 } x + 1 }\)

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