You need to give a formula for delta. It will depend on epsilon and c.
In response to the reply,no formula for delta depending on epsilon or c was given.For completeness sake,i will state the definition.
DEFINITION
Let , and let c be a cluster point of . For a function , a real number is said to be a limit of at c if, given any there exists a such that if and then .
QUESTION
Prove the following limit of a function using the (above) definition where
c > 0