[考古] 中山
請問兩題....
n 1
1.limΣ ------------------ =?
n->∞ (4n^2-k^2)^(1/2)
2. let 1-cosx
---------if x=/=0
x
f(x)=
0 if x=0
prove that f is differentiable on R,and f'(x)=?
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