1.

फलन ` f ( x ) ` निम्नवत परिभाषित है - ` f ( x ) = 1 ` यदि ` x gt 0 ` ` = - 1 ` यदि ` x lt 0 ` ` = 0 ` यदि ` x = 0 ` सिद्ध कीजिये कि ` lim _ ( x to 0 ) f ( x ) ` अस्तित्व में नहीं है |

Answer» ` f ( 0 - 0 ) = lim _ ( h to 0 ) f ( 0 - h ) = lim _ ( h to 0 ) ( - 1 ) = - 1 `
` f(0 + 0 ) = lim _ ( h to 0 ) f ( 0 + h ) = lim _ ( hto 0 ) 1 = 1 `


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