You should
remember that `a dx.`
Notice that 0<1 and you need to verify if `sqrt(1+x^2) < sqrt(1+x)
` over the interval [0,1] such that:
If `x in [0,1] => x^2 < x =>
x^2 + 1 < x + 1 => sqrt(x^2 + 1)
Since `sqrt(x^2 +
1)
`sqrt(x^2 + 1)
sqrt(x+1)dx`
Hence, using the properties of integrals yields
that inequality `int_0^1 sqrt(x^2 + 1) dx < int_0^1 sqrt(x+1) dx`
holds.
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