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What is the simplified form cotx/(tanx+cotx)? How to work out algebraically: (x+y)^-2 = x^-2(1+y/x)^-2? How to solve the following expression algebraically: (x+y)^-2 = x^-2(1+y/x)^-2 Thanks.? What does $1.25 x 6 equal? What is the magnitude of the net force needed to bring a 1620 kg car to rest from 16.7 m/s in 6.1 seconds?