import sys input = sys.stdin.readline from decimal import * getcontext().prec = 27 getcontext().rounding = ROUND_HALF_UP a, b, c = map(Decimal,map(int,input().split())) pi = Decimal('3.141592653589793238462643383') def sin(x) : x = x % (2 * pi) getcontext().prec += 2 i, lasts, s, fact, num, sign = 1, 0, x, 1, x, 1 while s != lasts: lasts = s i += 2 fact *= i * (i-1) num *= x * x sign *= -1 s += ..