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Question

যদি z=-y-

\frac{y^{2}}{2}

\frac{y^{3}}{3}

\frac{y^{4}}{4}

\infty

এবং y=1-x+

\frac{x^{2}}{2!}

\frac{x^{3}}{3!}

\infty

হয় তাহলে x এর মান কত?

(1+

e^{2}

)

(1+

e^{- z}

)

\ln (1 + 3 z)

\ln \frac{1}{(1 + 5 z)}

\ln \frac{1}{(1 + e^{z})}

ANS : 5

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