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.
Best Answer: arteries take blood away from the heart (oxygenated), veins take blood back to the heart (deoxygenated). They are separate systems joined together by capillary networks whereby gas exchange occurs.Source(s): HwPal-http://www.hwpal.com/.rteries are like the water pipes in your house. the veins would be the sewer pipes. the capillaries are the sinks where the water comes from the water pipes and goes to the sewer.