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Why cos has not negative sign |
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Answer» Signs (plus/minus) of SINE and COSINE in all Quadrants The number zero has no sign: 0 is not positive and 0 is not negative. Zero is NEUTRAL! For example, cosπ2=cos90∘=0 π 2 = cos 90 ∘ = 0 , hence has no sign. If a number is not defined, then (of course) it has no sign. |
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