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→Description
*This function will give the result as error when:
*This function will give the result as error when:
1.<math>x</math> is non-numeric
1.<math>x</math> is non-numeric
2.<math>x\le-1</math> or <math>x\ge</math> .
2.<math>x \le -1</math> or <math>x \ge 1</math> .
==Examples==
==Examples==