as4tep7honskyDeszz as4tep7honskyDeszz

24-11-2016
Mathematics

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Determine the sign of cos pi/3 without using a calculator.

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nobillionaireNobley nobillionaireNobley

26-11-2016

pi/3 is in the first quadrant, and all trigonometric functions are positive in the first quadrant,
Therefore, cos pi/3 is positive.

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