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.
Anatomy of Arteries vs Veins. Anatomy of an artery. Arteries that carry blood from the heart to other parts of the body are known as systemic arteries while those that carry deoxygenated blood to the lungs are known as pulmonary arteries.natomy of Arteries vs Veins. Anatomy of an artery. Arteries that carry blood from the heart to other parts of the body are known as systemic arteries while those that carry deoxygenated blood to the lungs are known as pulmonary arteries.