(1)=________. (2)=________. (3)=________. (4)=________.

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问题 (1)=________.
(2)=________.
(3)=________.
(4)=________.

选项

答案(1)[*] (2)[*] (3)[*] (4)[*]-ln(1+cosx)+C

解析 (1)
(2)因为(sin2x)’=2sinx.cosx=sin2x,
所以

(3)



(4)
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