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mathmate
 one year ago
Best ResponseYou've already chosen the best response.0let y=cos(pi/12), then apply the double angle formula: cos^2(x)sin^2(x)=cos(2x) or, substituting sin^2(x)+cos^2(x)=1, 2cos^2(x)1=cos(2x) cos^2(x)=(1+cos(2x))/2 let x=pi/12 then cos^2(pi/12)=(1+cos(pi/6))/2 Since cos(pi/6) is known to be sqrt(3)/2, cos(pi/12)=sqrt((1+sqrt(3)/2)/2)

VeroZarate
 one year ago
Best ResponseYou've already chosen the best response.0im sorry but thats not one of my options

VeroZarate
 one year ago
Best ResponseYou've already chosen the best response.0i somehow have to use the sum and difference formulas

mathmate
 one year ago
Best ResponseYou've already chosen the best response.0Are they in numerical values?

VeroZarate
 one year ago
Best ResponseYou've already chosen the best response.0yes they all have sqrt6 and sqrt2 over 4 but with different signs +/

mathmate
 one year ago
Best ResponseYou've already chosen the best response.0cos^2(x)sin^2(x)=cos(2x) is from the double angle formula.

VeroZarate
 one year ago
Best ResponseYou've already chosen the best response.0how would you split pi/12? i think thats what i need to do?

mathmate
 one year ago
Best ResponseYou've already chosen the best response.0You will need to evaluate each option to see if it evaluates to: sqrt((1+sqrt(3)/2)/2) which can be written as sqrt((2+sqrt(3)/4) or sqrt(2+sqrt(3))/2 Why don't you post the options if you're not sure?

VeroZarate
 one year ago
Best ResponseYou've already chosen the best response.0ok i think i got it thanks!!
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