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.
This is often a trick question, because a vein can carry oxygenated blood, and an artery can carry de-oxygenated blood in specific situations. **In general**, veins carry de-oxygenated blood towards the heart, and arteries carry blood rich in oxygen away from the heart.he pulmonary vein also carries oxygenated blood (from the lung back to the heart). The difference between an artery and a vein is that arteries carry blood away from the hear and veins carry blood to the heart. blankstar Â· 7 years ago. Thumbs up. 2. Thumbs down. 0. Comment. Add a comment.