题解 | #重载运算符#

from math import radians, sin
class Angle:
    def __init__(self, degrees):
        self.degrees = degrees
    def __sub__(self, other):
        return Angle(self.degrees - other.degrees)
    def sine(self):
        return sin(radians(self.degrees))
for _ in range(int(input())):
    angle1, angle2 = map(int, input().split())
    a1, a2 = Angle(angle1), Angle(angle2)
    print("{:.2f}".format((a1 - a2).sine()))