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**[sloved]Does anyone know how to find radius of convergence for sin x and e^x**

We know that to find radius of convergence we use ratio test (ie lim {a_n+1} /{a_n})

Can this method be used for sin x and e^x? ( whose radius of convergence is -infinity and infinity)

if radius of convergence is -infinity<x< infinity right? it means when we use ratio test the result is zero?

but we see for e^x,

i get |e| when using ratio test, which implies that it diverge?

Im confused. Can anyone can help?

thanks.

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