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mathmateBest ResponseYou've already chosen the best response.0
let 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)
 one year ago

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

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

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

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

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

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

mathmateBest ResponseYou've already chosen the best response.0
You 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?
 one year ago

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