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So are we human or are we dancers? How to solve the following expression algebraically: (x+y)^-2 = x^-2(1+y/x)^-2 Thanks.? □ cot(arccot 3 + arccot 7 + arccot 13 + arccot 21) is .? Could anyone help me solve this equation 11^(n-8 ) − 5 = 54? Thank you!!? An object with the mass of 15kg has 12 kj of kinetic energy. Calculate the velocity.?