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OpenStudy (anonymous):
cos(theta/2) if sin(theta)=2/root5, pi/2
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OpenStudy (anonymous):
please retype the question, im having difficulty understanding what is being asked?
OpenStudy (jdoe0001):
yacob841, what is the origiinal question again?
OpenStudy (anonymous):
sorry solve cos(θ/2) what you know prior sin(θ)=2/√5 and π/2<θ<2π
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