1.

If cos (A/2) = X, then the value of X is

A. \(\sqrt {\left[ {\frac{{1 - cosA}}{2}} \right]}\)
B. \(\sqrt {\left[ {\frac{{1\; + \;sinA}}{2}} \right]} \)
C. \(\sqrt {\left[ {\frac{{1 - sinA}}{2}} \right]}\)
D. \(\sqrt {\left[ {\frac{{1\; + \;cosA}}{2}} \right]}\)
Answer» E.


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