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OpenStudy (anonymous):
If x is a positive acute angle and cos x=1/9 what is the value of cos1/2x?
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OpenStudy (anonymous):
cosx = 2cos^2(1/2 x) -1
OpenStudy (anonymous):
Does it help?
OpenStudy (raden):
use the formula : |dw:1356084559439:dw|
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