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.
Arteries-carry blood away from the heart. (I like to think Arteries Away.) Veins-carry blood to the heart. Capillaries-connect veins and arteries. Arteries are the tubes o â¦ r vessles which carry the blood away from the heart once the blood has been oxygenated by the lungs.tructural similarities between artries and veins are 1) The walls of arteries and veins both contain collagen which makes them strong and durable. 2) They both contain elasti â¦ c fibres which allow them to stretch and recoil.