Mathematics
Undergraduate
f(x)=-log(cosx) (0<x<π/2)
とt>0に対して,x軸上の区間
E(t)={x|0<x<π/2, t≦f(x)≦t+1/t}
の長さをL(t)とする.
Eの変数はtなのにxってどういうことですか?
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