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Q:

If cos3A = X, then value of X?

  • 1
    4cos3A + 3cosA
  • 2
    3cosA – 4cos3A
  • 3
    cosA + 4cos3A
  • 4
    4cos3A – 3cosA
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Answer : 4. "4cos3A – 3cosA"

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