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13 February, 12:25

If sinx = 5/13 and x is in quadrant 1, then sin x / 2 = ...

a. - sqrt (5/26)

b. sqrt (5/26)

c. - sqrt (1/26)

d. sqrt (1/26)

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Answers (1)
  1. 13 February, 12:54
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    Sinx=5/13 then cosx=12/13 sin (x/2) = sqrt (1-cosx/2) = sqrt (1-12/13) / 2 = sqrt (1/26) = 1/sqrt (26)

    So, the answer will be D option sqrt (1/26).
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