Prove that an improper integral diverges looking at its graph

Like Tony Stark

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Apr 19, 2020
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Hi
I want to know how to realize if the improper integral of an absolute value function converges or diverges just looking at the graph and trying to calculate the area below the curve with triangles.
I mean, let's take the integral of |sinx/x| from 0 to infinity, and the same with |cosx/x|. How can I tell if they diverge or not by calculating the area with triangles ?
 
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