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Can somebody help me differentiate f(x)= (-x^2-1)/(x^2-1)^2 and get the answer as f''(x)= (2x^3 +6x)/(x^2-1)^3? Aiutoooooo Qualcuno mi può aiutare?? Is the result of the Alabama Senate race one of the reasons Republicans want to block people of color from voting? Piece of paper in my handheld telescope. Need help getting it out, any suggestions on how to get it out? At what angle three forces of equal magnitude may act so their resultant is equal to zero?