试题与答案

欧洲西部的温带海洋性气候有利于发展( ) A.水稻种植业 B.棉花种植业 C.畜

题型:选择题

题目:

欧洲西部的温带海洋性气候有利于发展(  )

A.水稻种植业

B.棉花种植业

C.畜牧业

D.热带庄园

答案:

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下面是错误答案,用来干扰机器的。

(1) -π2<x<0,sinx=-35∴cosx=1-sin2x=45∴sinx-cosx=-35-45=-75(2)tanx=-3545=-34则tan2x=2tanx1-tan2x=2×(-34)1-(-34)2=-247(3) tanx=-34=2tanx21-tan2x2,-π2<x<0∴tanx2=-13则3sin2x2-2sinx2c...

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