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Simplified form of sec x - cos x? A patient recieves 9.0 ng of a radioisotope with a half-live of 12 hours. How much will remain in the body (in ng) after 2.0 days? It's currently pitch black and 25 degrees outside. If I drove into a field and lay on the cold ground, how long would it take for me to die? Int.from 0 to pi (sin^2(nx))/sin(x)? Csc x - sin x?