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

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emhart2012Best ResponseYou've already chosen the best response.0
the formula is cos=+or 1+cos/2 all over a square root
 one year ago

emhart2012Best ResponseYou've already chosen the best response.0
so it will be…. 1 + cos(5pi/12)/2 all under a square root
 one year ago

AFleming42Best ResponseYou've already chosen the best response.0
that makes absolutely no sense to me...
 one year ago

AFleming42Best ResponseYou've already chosen the best response.0
is that the final answer?
 one year ago

emhart2012Best ResponseYou've already chosen the best response.0
no you need to solve it on you calculator
 one year ago

AFleming42Best ResponseYou've already chosen the best response.0
ehhh 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
 one year ago

jim_thompson5910Best ResponseYou've already chosen the best response.1
cos (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) )
 one year ago

AFleming42Best ResponseYou've already chosen the best response.0
Thank you @jim_thompson5910 (:
 one year ago
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