B"The statement of this problem is the same as the statement of problem C2. The only difference is that, in problem C1, n is always even, and in C2, n is always odd. You are given a regular polygon with 2 cdot n vertices (it's convex and has equal sides and equal angles) and all its sides have length 1 . Let's name it as 2n -gon. Your task is to find the square of the minimum size such that you can embed 2n -gon in the square. Embedding 2n -gon in the square means that you need to place 2n -gon in the square in such way that each point which lies inside or on a border of 2n -gon should also lie inside or on a border of the square. You can rotate 2n -gon and/or the square. The first line contains a single integer T ( 1 <= T <= 200 ) -- the number of test cases. Next T lines contain descriptions of test cases -- one per line. Each line contains single even integer n ( 2 <= n <= 200 ). Don't forget you need to embed 2n -gon, not an n -gon. Print T real numbers -- one per test case. For each test case, print the minimum length of a side of the square 2n -gon can be embedded in. Your answer will be considered correct if its absolute or relative error doesn't exceed 10^{-6} . "...