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OpenStudy (anonymous):
need super help
find the exact value of cos theta/2 given... sintheta= 5/13,90degrees
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OpenStudy (anonymous):
c since sin theta = 5/13, then cos theta = 12/13; Use the cos theta/2 identity to solve this
OpenStudy (anonymous):
thank you
OpenStudy (anonymous):
cos theta/2 = +- sqrt ((1 + cos theta)/2) = sqrt ((1 + 12/13)/2) sqrt (25/13 /2) = sqrt (25/26) = 5/sqrt 26 = 6 root 26/26
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