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    				| 1. | सिद्ध कीजिये कि फलन ` f ( x) = sin x, x = (pi)/(2) ` पर सतत है | | 
| Answer» ` f ( (pi)/(2)) = sin "" (pi ) /(2) = 1 ` और ` lim _ ( x to pi//2) f ( x ) = lim _ ( xto pi//2) sin x = sin ""(pi)/(2) = 1 ` स्पष्टतः ` f ( (pi)/(2)) = lim _ ( x to pi//2) f ( x ) ` ` rArr x = pi//2 ` पर ` f ( x) ` सतत है | | |