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.
Veins are blood vessels carrying blood towards the heart, whereas arteries bring blood away from heart. Mostly, arteries contain oxygenated blood, and veins contain carbon dâ¦ioxide-rich and oxygen-poor blood; however, there is one exception.
Arteries carry blood away from the heart. Veins carry blood toward the heart. Whether or not that blood is oxygenated is not exclusively related to whether or not it's an artery or a vein. For example, the pulmonary artery carries deoxygenated blood while the carotid artery carries oxygenated blood.