数学通式0,1,0,-1,0,1,0,-1...写出通式...

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数学通式0,1,0,-1,0,1,0,-1...写出通式...数学通式0,1,0,-1,0,1,0,-1...写出通式...数学通式0,1,0,-1,0,1,0,-1...写出通式...an=sin(

数学通式0,1,0,-1,0,1,0,-1...写出通式...
数学通式0,1,0,-1,0,1,0,-1...
写出通式...

数学通式0,1,0,-1,0,1,0,-1...写出通式...
an=sin(nπ/2)

(1/2)*[1^n+(-1)^n],