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.
1 The difference is that an artery brings blood to the body and a vein takes blood to the lungs.  Arteries and Veins are part of the circulatory system, where arteries carry the blood from the heart to the organs, and the veins carry it from the organs to the heart again.
First and foremost, the most basic difference between Veins and Arteries is that arteries take blood away from the heart, and then veins take blood back to the heart. Secondly, The veins that carry oxygenated blood around the body are red, while the veins that carry the deoxygenated blood away from the body are blue.