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.
Arteries, on the other hand, are classified as systemic (part of the cardiovascular system), pulmonary (carry blood to the lungs), aorta and arterioles. Arteries carry bright red blood as it is oxygenated while veins have the dark red blood. Arteries progressively divide into smaller tubes unlike veins.
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.