mathop {lim }limits_{n to infty } ,left( {fra | vedclass

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(D) આપેલ પદાવલિ $\mathop {\lim }\limits_{n 	o \infty } \sum\limits_{r = 1}^{2n} {\frac{n}{{{n^2} + {r^2}}}}$ છે.આપણે સામાન્ય પદને $\frac{n}{n^2(1 + (

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$	an^{-1}(2)$

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(D) આપેલ પદાવલિ $\mathop {\lim }\limits_{n 	o \infty } \sum\limits_{r = 1}^{2n} {\frac{n}{{{n^2} + {r^2}}}}$ છે.આપણે સામાન્ય પદને $\frac{n}{n^2(1 + (r/n)^2)} = \frac{1}{n} \cdot \frac{1}{1 + (r/n)^2}$ તરીકે લખી શકીએ છીએ.નિશ્ચિત સંકલનની વ્યાખ્યા મુજબ,$\mathop {\lim }\limits_{n 	o \infty } \sum\limits_{r=1}^{kn} \frac{1}{n} f(\frac{r}{n}) = \int_0^k f(x) dx$.અહીં,$f(x) = \frac{1}{1+x^2}$ અને ઉપલી સીમા $2$ છે (કારણ કે $r$ એ $2n$ સુધી જાય છે).તેથી,સંકલન $\int_0^2 \frac{1}{1+x^2} dx$ બને છે.સંકલનનું મૂલ્ય શોધતા,આપણને $[	an^{-1}(x)]_0^2 = 	an^{-1}(2) - 	an^{-1}(0) = 	an^{-1}(2)$ મળે છે.

$\mathop {\lim }\limits_{n \to \infty } \,\left( {\frac{n}{{{n^2} + {1^2}}} + \frac{n}{{{n^2} + {2^2}}} + \frac{n}{{{n^2} + {3^2}}} + ... + \frac{n}{{{n^2} + {{(2n)}^2}}}} \right)$ ની કિંમત શોધો.

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