ポイントは時針も分単位で動く事でしょうか。
abc168c.py
from math import *
A,B,H,M = map(int,input().split())
degH = H*60*0.5+M*0.5
degM = M*6
deg = abs(degH-degM)
ans = A**2+B**2-2*A*B*cos(radians(deg))
print("{:.9f}".format(sqrt(ans)))
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