- 2 is to 55 as 6 is to:?

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Whats the derivative of arccot(sqrt x)? What reactive effect come into consideration while performint short circuit test and why? Prove that there are infinitely many prime numbers of the form (2^n+1), where n is a positive integer.? Math fraction help (discussion 5)? He had to take time off from Cambridge due to Second Black Plague, but later outlined the laws of basic physics?