The arctangent is the inverse tangent function. Since. tan Ï/4 = tan 45Âº = 1. The arctangent of 1 is equal to the inverse tangent function of 1, which is equal to Ï/4 radians or 45 degrees: arctan 1 = tan-1 1 = Ï/4 rad = 45Âº. 1  Arctan.  Arctan calculator.
1 The difference is that an artery brings blood to the body and a vein takes blood to the lungs.  Arteries and Veins are part of the circulatory system, where arteries carry the blood from the heart to the organs, and the veins carry it from the organs to the heart again.
Generally most veins carry deoxygenated blood. Arteries carry oxygenated blood. The correct way to think about it is that Veins carry blood to the heart, whilst arteries carry blood away from the heart.This means in most cases, the blood carried by veins will be deoxygenated, whilst the blood carried by arteries is oxygenated.he correct way to think about it is that Veins carry blood to the heart, whilst arteries carry blood away from the heart. This means in most cases, the blood carried by veins will be deoxygenated, whilst the blood carried by arteries is oxygenated.