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.
An artery is a hollow tube that carries blood from the heart to all the different regions of the body. What is the difference between an artery and a vein? The arteries take blood away from your heart to all the different organs in your body, including your brain, kidneys and liver.Arteries also take blood from the heart to all your limbs.he arteries take blood away from your heart to all the different organs in your body, including your brain, kidneys and liver. Arteries also take blood from the heart to all your limbs.