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.
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.