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linshan789

  • 3 years ago

Integration Problem...HELP!!!

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  1. linshan789
    • 3 years ago
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    |dw:1361641769890:dw|

  2. linshan789
    • 3 years ago
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    Any ideas?

  3. sirm3d
    • 3 years ago
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    use the identity \[\frac{1}{2}\cos(A-B)\cos(A+B)=\cos(A)\cos(B)\]

  4. sirm3d
    • 3 years ago
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    put \[A=4x, B=3x\]

  5. TuringTest
    • 3 years ago
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    \[\frac{1}{2}[\cos(A-B)+\cos(A+B)]=\cos(A)\cos(B)\]

  6. linshan789
    • 3 years ago
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    Isn't that an identity for sin? Is it the same for cos?

  7. TuringTest
    • 3 years ago
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    there are 4 essential sum to product formulas http://tutorial.math.lamar.edu/pdf/Trig_Cheat_Sheet.pdf

  8. linshan789
    • 3 years ago
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    Cool, thanks guys.

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