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For each limit limx→cf(x)=Lin Exercises 43–54, use graphs and algebra to approximate the largest value of δsuch that if x∈(c-δ,c)∪(c,c+δ)thenf(x)∈(L-ε,L+ε).

limx→01-cosxx=0,ε=14

Short Answer

Expert verified

The largest value ofδ≈0.511.

Step by step solution

01

Step 1. Given Information.

The given expression is limx→01-cosxx=0,ε=14.

02

Step 2. Explanation. 

From the given expression, we have,c=0,L=0

The limit expression can be written as a formal statement as below,

For all epsilon positive, there exists a delta positive such that if

x∈(0-δ,0)∪(0,0+δ)then1-cosxx∈(0-ε,0+ε)

Now, the largest value of delta is given by,

1-cosxx=L+ε1-cosxx=0+141-cosxx=14x=4-4cosxx≈0.511

Thus,

δ=0.511-0δ≈0.511

03

Step 3. Conclusion.

The largest value ofδ≈0.511.

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