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DLS Group Title

cos36?

  • one year ago
  • one year ago

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  1. hartnn Group Title
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    really ?

    • one year ago
  2. hartnn Group Title
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    without calcy ?

    • one year ago
  3. hartnn Group Title
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    first can u find sin 18 without calcy ?

    • one year ago
  4. DLS Group Title
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    noo :/

    • one year ago
  5. hartnn Group Title
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    pretty standard

    • one year ago
  6. hartnn Group Title
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    let x= 18 5x = 90 3x = 90-2x now take sin on both sides.

    • one year ago
  7. hartnn Group Title
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    sin 3x = sin(90-2x) sin 3x = cos 2x

    • one year ago
  8. hartnn Group Title
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    now put the formula fo sin 3x and cos 2x in terms of powers of sin x only.

    • one year ago
  9. hartnn Group Title
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    u get a cubic in sin x. solve it.

    • one year ago
  10. DLS Group Title
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    wait,theres a formula for sin3x? :P

    • one year ago
  11. hartnn Group Title
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    absolutely.

    • one year ago
  12. DLS Group Title
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    :O

    • one year ago
  13. hartnn Group Title
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    sin 3x = 3sin x - 4 sin^3 x

    • one year ago
  14. DLS Group Title
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    okay yes ! i remember :P

    • one year ago
  15. DLS Group Title
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    thanks!

    • one year ago
  16. DLS Group Title
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    okay I guess i can do it now

    • one year ago
  17. hartnn Group Title
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    from sin 18, u get cos 36 from the formula of cos 2x in terms of sin x

    • one year ago
  18. hartnn Group Title
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    good :)

    • one year ago
  19. DLS Group Title
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    :D

    • one year ago
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