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OpenStudy (sabrina1):
give cos(o)=7/9 and 0<0>pi/2 find the exact value of cos(o/2) decimals not allowed. can someone please help me solve this problem i've tried everything and cant seem to resolve it.
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OpenStudy (anonymous):
use cos(2x)=2cos^2(x)-1
OpenStudy (sabrina1):
okay but am i plugging in values or thats the answer because id like to know how you got that
OpenStudy (anonymous):
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