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.
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.