2MORE-XUHUI 14

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2MORE-XUHUI 14
2MORE-XUHUI 14

2MORE-XUHUI 14
a1=a
a2=1/2(90-a1)
a3=1/2(90-a2)
an=1/2[90-a(n-1)]=45-1/2a(n-1)
x-an=-1/2[x-a(n-1)]
an=-3x/2-1/2a(n-1)
-3x/2=45,x=30
30-an=-1/2[30-a(n-1)]
30-an=(-1/2)^(n-1)a1
an=30-(-1/2)^(n-1)a1
lim an=30-0=30°
n---->无穷

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