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

User Kalesh Kaladharan
by
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1 Answer

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

User Jin Nii Sama
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8.7k points
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