\"\"

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Original function is \"\"

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Replace x = 4 in original function.

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\"\"                          (Evaluate power: \"\")

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\"\"                         (Evaluate power: \"\")

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\"\"                                 (Subtract: \"\")                          \"\"

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Replace x = – 2 in original function.

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\"\"                    (Evaluate power: \"\")

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\"\"                            (Evaluate power: \"\")

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\"\"                                  (Subtract: \"\")              \"\"

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\"\" and \"\".

\