angelaalien13
angelaalien13
28-12-2017
Mathematics
contestada
7) WILL MARK BRAINLIEST + 10 POINTS :)
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tynollette
tynollette
28-12-2017
use the half angle identity: cos(A/2)=+/- √[(1+cosA)/2]
π/12 is half of π/6, and cosπ/6=√3/2, so
cons(π/12)=√[(1+√3/2)/2]=(1/2)√(2+√3)
C is the answer.
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