Kwashiorkor is a severe form of malnutrition. It's most common in some developing regions of the world where babies and children have a diet that lacks protein and other essential nutrients. The main sign of kwashiorkor is too much fluid in the body's tissues, which causes swelling under the skin (oedema).
Since r=2sinθ is a circle that has a center at (0,1) and a radius of 1. At pi/2 or when x=0 the tangent line would be a horizontal line and have a slope of 0.
