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.
Arteries, on the other hand, are classified as systemic (part of the cardiovascular system), pulmonary (carry blood to the lungs), aorta and arterioles. Arteries carry bright red blood as it is oxygenated while veins have the dark red blood. Arteries progressively divide into smaller tubes unlike veins.
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.