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RonnyDeKoning

  • 3 years ago

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

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  1. mark_o.
    • 3 years ago
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    do you know the formula for cos 2A?

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

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

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

  5. mark_o.
    • 3 years ago
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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

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

  7. mark_o.
    • 3 years ago
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    ok...thnx ...:D good luck now ':D

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