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.
Arteries carry blood away from the heart, e.g aorta and pulmonary artery, arteries are thick, the inside of them is made of epithelial cells as they are smooth, they help blood flow more easily, the middle layer is muscle, these can go along with pulses to help them.eins carry the blood back from the other areas of the body to the heart. Simply put, an artery carries blood out of the heart, and a vein carries blood into the heart. Arteries are under more pressure than veins. Arteries contract to help push blood through whereas blood flow through veins is passive.