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An expanding universe must be flat,that is to say,euclidian geometry must be valid for large scales? What is a number 2 comb? If cos x = 3/7; x is an angle in the fourth quadrant; what is cos(x/2)? What is the torque produced by the weight of Bob?.Mass of bob=0.50kg,length of rope:40cm.angle : 60° Options:0.49/3.4/1.7/1 Nm? Strongest sedative?