- Find this magnitude ||5-3i||?

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How many country in the whole world? What is the tonnage of one cubic metre of quarry stone? Find the area under the standard normal distribution curve between z = 0 and z = -2.16? 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? Is a trapezium different from a trapezoid?