- What is the derivative of arctan(y/x) with respect to x once and then with respect to y?

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Which continent is the longest north to south ? Can antimatter be found in nature? Or is it rather a substance the futurists believe that needs to be artificially created in a lab? How many grams of fluorine gas occupy 543.2 mL and expect 123456 Pa of pressure at 29.8 degrees Celsius? A polynomial has remainder 3 when divided by (x-2) and a remainder of -5 when divided by (x+2) what is the remainder when divided by (x^2-4)? How is power delivered by a 3 phase motor?