The 3rd Style
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When X approaches a negative number from the left (negative) side its getting infinitely large.
When X approaches a negative number from the right side its getting infinitely small.
When X approaches a positive number from the left side its getting infinitely small.
When X approaches a positive number from the right side its getting infinitely large.
When X approaches a negative number from the right side its getting infinitely small.
When X approaches a positive number from the left side its getting infinitely small.
When X approaches a positive number from the right side its getting infinitely large.