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.
Making the world better, one answer at a time. Arteries are the blood vessels that take blood away from the heart. Blood in the arteries are brown as they go away from the heart and blood travelling to the heart in veins are coloured red as it has just been replenished when passing the lungs.aking the world better, one answer at a time. Arteries are the blood vessels that take blood away from the heart. Blood in the arteries are brown as they go away from the heart and blood travelling to the heart in veins are coloured red as it has just been replenished when passing the lungs.