单词	arc tangent
释义	arc tangent /ˈɑːktan(d)ʒ(ə)nt / (abbreviation arctan) noun A mathematical function that is the inverse of the tangent function.In the 14th century, Madhava, isolated in South India, developed a power series for the arc tangent function, apparently without the use of calculus, allowing the calculation of pi to any number of decimal places.... When we find an arctan of a reciprocal of an even-indexed Fibonacci number, we can use to replace it by a sum of two terms, one an odd-indexed Fibonacci number and another even-indexed Fibonacci number. We can put this in words as ‘The final arctan is just 1 more than the product of the other two (whose denominators differ by one).’
随便看	throw something out throw something overboard throw something together throw something up throwster throw the baby out with the bathwater throw the book at throw up throw up one's hands thru thrum thrummer thrummy thrush thrush nightingale thrust thrust bearing thrust block thruster thrust fault thrusting thrust reverser thrust slice thrust stage thrutch

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