从你写的情况看,原题是:f(x)是奇函数,要证F(x)是偶函数。
t=-u
t:a→-x,u:-a→x
∫[a:-x]f(t)dt
=∫[-a:x]f(-u)d(-u)
=∫[-a:x](-1)·f(-u)du
=-∫[-a:x]f(-u)du
=-∫[-a:x][-f(u)]du
=-[-∫[-a:x]f(u)du]
=∫[-a:x]f(u)du
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