已知f(n)=sin(nπ/6),则f(1)+f(2)+f(3)+…+f(2012)=.

日期:2012-06-29 22:22:56 人气:2

已知f(n)=sin(nπ/6),则f(1)+f(2)+f(3)+…+f(2012)=.

f(1)=sin(π/6)=1/2 f(2)=sin(π/3)=√3/2 f(3)=sin(π/2)=1 f(4)=sin(2π/3)=√3/2 f(5)=sin(5π/6)=1/2 f(6)=sin(π)=0 f(7)=sin(7π/6)=-1/2 f(8)=sin(4π/3)=-√3/2 f(9)=sin(3π/2)=-1 f(10)=sin(5π/3)=-√3
    A+
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