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please slove this exercise step by step !!
thank you for consider my help.
Compute the following limit f(x) – f(0)co COS lim 20 3 tanz
Find the radius of convergent R and the set of convergent D of the power series 1 Σ 2n + 5.
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Hence series converge ولحل E (-22) So, Radius of 2 onvergence and set of convergence (-2, 0)

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