1.

Why cos has not negative sign

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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