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chikaa Group Title

integral of cos(3x-5)^2

  • one year ago
  • one year ago

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  1. amrmagdy Group Title
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    use double angles rules

    • one year ago
  2. amrmagdy Group Title
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    cos2x=2cosx-1 .. did you get it ?

    • one year ago
  3. chikaa Group Title
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    and what about the cos^2

    • one year ago
  4. amrmagdy Group Title
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    sry cos2x=2cosx^2-1

    • one year ago
  5. myininaya Group Title
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    Recall the double angle identity for cosine. \[\cos(2 \alpha )=\cos^2(\alpha)-\sin^2(\alpha)=\cos^2(\alpha)-(1-\cos^2(\alpha))\] \[\cos(2 \alpha)=\cos^2(\alpha)-1+\cos^2(\alpha)\] \[\cos(2 \alpha)=2 \cos^2(\alpha)-1\] Solve this equation for cos^2(alpha): \[\cos^2(\alpha)=\frac{1}{2}(1+\cos(2 \alpha))\]

    • one year ago
  6. chikaa Group Title
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    Thank you Amrmagdy and Myininaya :D

    • one year ago
  7. amrmagdy Group Title
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    urw

    • one year ago
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