括号是不是写错了a1=1,a2=2,an+2=(cos^2（nπ）/2)an+sin^2（nπ/2）,则a2013=1
高一数学数列an满足:a1=1,a2=2,an+2=(cos^2（nπ）/2)an+sin^2(nπ)/2 则a2013
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