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How do I find the value of cos B from: tan B/2, given tan B = -sqrt(11)/5, with pi/2 < B < pi The answer is -5/6, but how do they get it? How do you check if fsolve command is working in Maple? What is the mass of carbon in a 5-carat diamond that contains 5.00 x 10^22 atoms of carbon? MATH HELP. Can you do this question? In Chemistry, why if the oil is heavier than water it goes up from the water if you put them in a glass?