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RonnyDeKoning Group Title

By the doublingsformulas there are 3 kinds for Cos 2 Aplha, which one do i need to use?

  • 2 years ago
  • 2 years ago

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  1. mark_o. Group Title
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    do you know the formula for cos 2A?

    • 2 years ago
  2. RonnyDeKoning Group Title
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    |dw:1353240750557:dw| Which i have to use when?

    • 2 years ago
  3. mark_o. Group Title
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    ok good, which one do you need to use? it depends on what you are trying to solve

    • 2 years ago
  4. RonnyDeKoning Group Title
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    If i got fore eg: the sinus given I need to use the 3rth, there 3 different formulas?

    • 2 years ago
  5. mark_o. Group Title
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    for example you are trying to prove an identity that has a sine functions, then you can try to use the 3rd formula

    • 2 years ago
  6. mark_o. Group Title
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    but if it involves cosines functions then use the 2nd formula

    • 2 years ago
  7. mark_o. Group Title
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    ok...thnx ...:D good luck now ':D

    • 2 years ago
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