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.
What is the Difference Between Arteries, Veins, Blood Vessels and Capillaries? Arteries have a higher blood pressure than veins. A diagram of the human head and neck, including the arteries in red. A diagram of the aorta, the largest artery in the body. A diagram showing the composition of a blood vessel. Capillaries connect the arterioles and the venules.