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How to find the derivative of y = ln(1/(x*sqrt(x + 1))? A sector of a circle radius r, has a total perimeter of 12cm.If its area is Bcm^2,show that B = 6 - r^2? Need help describing the relationship between each variable in a combined gas law. (P1V1/T1 = P2V2/T2)? Is there an explanation for the relaxation effect that the sound of rain produces? How can we differentiate FeCl2 and FeCl3 solutions ? Suggest an easy way.?