Friday, 9 November 2018

calculus - Show that intinfty0left(fracsin(x)xright)2<2



I`m trying to show that this integral is converges and <2
0(sin(x)x)2dx<2


What I did is to show this expression:
10(sin(x)x)2dx+1(sin(x)x)2dx

Second expression :
1(sin(x)x)2dx<1(1x2)2dx=limb01x|b0=1

Now for the first expression I need to find any explanation why its <1 and I will prove it.

I would like to get some advice for the first expression. thanks!



Answer



Hint: limx0sinxx=1.


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