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If cos x = 3/7; x is an angle in the fourth quadrant; what is cos(x/2)? What dose the pb butter on keyboard do? Need help answering this math problem.? What is the pH of a 0.210 M aqueous solution of potassium nitrite, KNO2? pH =? In a circle of radius 180 cm, and arc 276 cm long subtends an angle of how many radians? How many degrees?