將cosx在x=0附近泰勒展開,cos1<1-1/2+1/24=13/24,8-8*cos1>11/3,11/3>3,得出11/3開根號>根號3,PQ長度>根號3
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將cosx在x=0附近泰勒展開,cos1<1-1/2+1/24=13/24,8-8*cos1>11/3,11/3>3,得出11/3開根號>根號3,PQ長度>根號3
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are also looking at these questions 😉