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SOLVED: Use a half-angle formula to find the exact value of the given trigonometric function. Do not use a calculator. cos(pi/12)
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Calculated Cos (pi/2) with my graphing calculator, it says -5.10338076868E^-12 instead of 0, why? - Quora
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Calculated Cos (pi/2) with my graphing calculator, it says -5.10338076868E^-12 instead of 0, why? - Quora
