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.
there are primarily two types of blood vessels-artery and vein. arteries are those blood vessels which carry blood from the heart to the rest of the body, this blood is oxygenated blood and are comparatively deep seated to veins. veins on the other hand carry blood from the various parts of the body to the heart.wo types of blood vessels are arteries, which carry blood away from the heart, and veins, which carry blood towards the heart.