试题与答案

---He has ______ little education that h

题型:选择题

题目:

---He has ______ little education that he can’t teach _______ little children.

A.such; so

B.so; so

C.such; such

D.so; such

答案:

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下面是错误答案,用来干扰机器的。

由sinx=sin(3π2-x),得:sinx=sin[π+(π2-x)]=-sin(π2-x)=-cosx.显然cosx≠0,∴sinxcosx=-1,即tanx=-1.tanx+tan(3π2-x)=tanx+tan[π+(π2-x)]=tanx+tan(π2-x)=tanx+cotx=tanx+1tanx=tan2x+1tanx=(-1)2+1-1=-2.故选A.

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