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gajohnson
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Homework Statement
This isn't really a homework question, just working through Rudin and got caught up on something. [itex]C(x)[/itex] and [itex]S(x)[/itex] refer to [itex]cos(x)[/itex] and [itex]sin(x)[/itex] respectively.
Here is the section in question:
http://grab.by/mSo8
Homework Equations
The Attempt at a Solution
Well the part I'm having trouble understanding is the claim: "Hence, if [itex]0≤x≤y[/itex], we have [itex]S(x)(y-x)<\int^{y}_{x}{S(t)}dt = C(x)-C(y)≤2[/itex]"
In particular, the inequality [itex]S(x)(y-x)<\int^{y}_{x}{S(t)}dt[/itex] is not clear to me. I reviewed a number of integration theorems but couldn't come up with anything that states this. Any help understanding how this inequality is derived would be much appreciated!
EDIT: OK, this might be really obvious. Is this simply true by the definition of the Riemann integral?
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