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

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

RonnyDeKoningBest ResponseYou've already chosen the best response.0
dw:1353240750557:dw Which i have to use when?
 one year ago

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

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

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

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

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