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Integration(k*Pi, 2k * Pi, |cost|) = k * Integration(0, Pi, |cost|) = 2k;
lim Integration(k*Pi, 2k * Pi, |cost|) /(k*Pi) = 2/Pi.
lim Integration(x, 2x, |cost|) / x
= lim k*Pi / x *
[Integration(2k *Pi, 2x, |cost|)-Integration(k * Pi, x, |cost|) + Integration(k*Pi, 2k * Pi, |cost|)]/(k*Pi)
=1 * (0 + 2/Pi) = 2/Pi.
ÆäÖÐk*Pi <= x < (k+1)*Pi.
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