It is known that exists, and let it be .
Find the following limit, if it exists, otherwise key in 9999.
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x → 0 lim x ( 1 + x ) x 1 − e = A ⟹ x → 0 lim x lo g ( 1 + x ) = lo g ( A x + e ) Maclaurin series for lo g ( 1 + x ) = x − 2 x 2 + 3 x 3 − ⋯ x → 0 lim x x − 2 x 2 + ⋯ = lo g ( e ) + lo g ( e A x + 1 ) Using lim x → 0 lo g ( 1 + x ) = x We get 1 − 2 x = 1 + e A x ⟹ A = − 2 e Using Maclaurin series of e x lo g ( 1 + x ) e x lo g ( 1 + x ) = x → 0 lim ( 1 + x ) x 1 = e 1 − 2 x + 3 x 2 + ⋯ x → 0 lim ( 1 + x ) x 1 = e − 2 e x + 2 4 1 1 e x 2 + ⋯ x → 0 lim x ( 1 + x ) x 1 − e = − 2 e + 2 4 1 1 e x x → 0 lim x x ( 1 + x ) x 1 − e − A = 2 4 x 1 1 e x = 2 4 1 1 e