Check convergence of integral: ∫10dx|sinx|1/2
My attempt
Dirichlet's test would't help there so I am going to use comparison test:
x≥sinx1x≤1sinx1|x|≤1|sinx|1|x|1/2≤1|sinx|1/2
So
∫10dx|sinx|1/2≥∫101|x|1/2
But ∫101|x|1/2 converges so it doesn't help me.
Answer
Instead of using the upper bound sinx≤x, use the to lower bound sinx≥2xπ, which follows from sinx being concave on [0,π/2].
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