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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Deepak singh 1
by sequential approach - take sequence Xn=1/nπ and Yn = 1/(π/2+nπ) and check limit n tends 0 f(Xn) & limit n tends to 0 f(Yn) , both will be not equal implies limit not exist at x= 0