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

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mark_o.
 2 years ago
Best ResponseYou've already chosen the best response.1do you know the formula for cos 2A?

RonnyDeKoning
 2 years ago
Best ResponseYou've already chosen the best response.0dw:1353240750557:dw Which i have to use when?

mark_o.
 2 years ago
Best ResponseYou've already chosen the best response.1ok good, which one do you need to use? it depends on what you are trying to solve

RonnyDeKoning
 2 years ago
Best ResponseYou've already chosen the best response.0If i got fore eg: the sinus given I need to use the 3rth, there 3 different formulas?

mark_o.
 2 years ago
Best ResponseYou've already chosen the best response.1for example you are trying to prove an identity that has a sine functions, then you can try to use the 3rd formula

mark_o.
 2 years ago
Best ResponseYou've already chosen the best response.1but if it involves cosines functions then use the 2nd formula

mark_o.
 2 years ago
Best ResponseYou've already chosen the best response.1ok...thnx ...:D good luck now ':D
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