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Itel

Help please Verify the identity. cos 4x + cos 2x = 2 - 2 sin^2 2x - 2 sin^2 x

  • one year ago
  • one year ago

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  1. shining
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    cos 4x = 2cos^2 2x - 1 cos 2x = 2cos^2 x -1 result:2-2sin^ 2x - 2sin^2 x

    • one year ago
  2. Itel
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    so 2cos^2 2x - 1 + 2cos^2 2x - 1= 2-2sin^ 2x - 2sin^2 x?

    • one year ago
  3. asnaseer
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    do you know how to express \(\cos(2x)\) in terms of \(\sin(x)\)?

    • one year ago
  4. asnaseer
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    using the double-angle formulae

    • one year ago
  5. shining
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    yes , you should first optimize it wheter you know double angle formulas or not?

    • one year ago
  6. Itel
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    so am I right then? That so 2cos^2 2x - 1 + 2cos^2 2x - 1= 2-2sin^ 2x - 2sin^2 x?

    • one year ago
  7. shining
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    yes , it was great

    • one year ago
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