问题
选择题
设f(x)=
|
答案
∵设f(x)=
sintdt，∫ x0
∴f（
）=π 2
sintdt=(-cost)∫
0π 2
=1，|
0π 2
∴f[f(
)]=f（1）=∫01sintdt=1-cos1．π 2
故选D．
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设f(x)=
|
∵设f(x)=
sintdt，∫ x0
∴f（
）=π 2
sintdt=(-cost)∫
0π 2
=1，|
0π 2
∴f[f(
)]=f（1）=∫01sintdt=1-cos1．π 2
故选D．
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