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4}
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A
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2
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y
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1
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z
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z
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2
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C.
4.
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f
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x
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3
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B
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f
(
x
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cos 2
x
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4
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x
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sin 2
x
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sin 2
x
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飪?/p>
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飪?/p>
0
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4
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a
鐨勬渶澶у�间负
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4
.
5.5
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(
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)
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1
2
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.
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