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Which of the following expressions could not be used to determine the exact value of cos 60? 2sin(30)cos(309) O cos2(309) - sin2(309) O 2cos2(309) -

Which of the following expressions could not be used to determine the exact value of cos 60? 2sin(30)cos(309) O cos2(309) - sin2(309) O 2cos2(309) - 1 O 1 - 2sin2(309)

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