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If cos x = 3/7; x is an angle in the fourth quadrant; what is cos(x/2)? The height at which the acceleration due to gravity becomes g/9. in terms of r, radius of the earth is? Can Squirrels carry parvovirus? Find the median grade if the grades a student received in five subject are 85, 76, 93, 82 and 96.? What are 2 characteristics of high mass stars?