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      Question

      The value of cos20┬░ cos40┬░ cos60┬░ cos80┬░

      A 1/2 Correct Answer Incorrect Answer
      B 1/4 Correct Answer Incorrect Answer
      C 1/8 Correct Answer Incorrect Answer
      D 1/16 Correct Answer Incorrect Answer

      Solution

      cos╬╕ cos2╬╕ cos4╬╕ = 1/4cos3╬╕ cos20┬░ cos40┬░ cos60┬░ cos80┬░ = 1/4cos20┬░ ├Ч 3 ├Ч cos60┬░┬а = 1/4cos60┬░ ├Ч cos60┬░ = 1/4 ├Ч 1/2 ├Ч 1/2 = ┬а1/16

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