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 2 years ago
Find the exact value by using a halfangle identity.
cos (5π/12)
I have no clue how to do this....
 2 years ago
Find the exact value by using a halfangle identity. cos (5π/12) I have no clue how to do this....

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emhart2012
 2 years ago
Best ResponseYou've already chosen the best response.0the formula is cos=+or 1+cos/2 all over a square root

emhart2012
 2 years ago
Best ResponseYou've already chosen the best response.0so it will be…. 1 + cos(5pi/12)/2 all under a square root

AFleming42
 2 years ago
Best ResponseYou've already chosen the best response.0that makes absolutely no sense to me...

AFleming42
 2 years ago
Best ResponseYou've already chosen the best response.0is that the final answer?

emhart2012
 2 years ago
Best ResponseYou've already chosen the best response.0no you need to solve it on you calculator

AFleming42
 2 years ago
Best ResponseYou've already chosen the best response.0ehhh I have an example problem for sin and the answer isn't an exact value and there's a heck of a lot more steps

jim_thompson5910
 2 years ago
Best ResponseYou've already chosen the best response.1cos (5pi/12) = cos ((1/2)*(5pi/6)) cos (5pi/12) = sqrt( (1+cos(5pi/6))/2 ) cos (5pi/12) = sqrt( (1sqrt(3)/2)/2 ) cos (5pi/12) = sqrt( 1/2sqrt(3)/4 ) cos (5pi/12) = sqrt( (2sqrt(3))/4 ) cos (5pi/12) = sqrt(1/4)*sqrt( 2sqrt(3) ) cos (5pi/12) = (1/2)*sqrt( 2sqrt(3) )

AFleming42
 2 years ago
Best ResponseYou've already chosen the best response.0Thank you @jim_thompson5910 (:
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