答:
設(shè)t=tanx,sinx=tcosx
代入(sinx)^2+(cosx)^2=1有:
(t^2+1)(cosx)^2=1
(cosx)^2=1/(1+t^2)
所以:
f(tanx)=(sinx)^2+sinxcosx+1
f(t)=t^2/(1+t^2)+t(cosx)^2+1
=t^2/(1+t^2)+t/(1+t^2)+1
=(t^2+t+1+t^2)/(1+t^2)
所以:
f(x)=(2x²+x+1)/(x²+1)
若函數(shù)f(tanx)=sin2x+sinxcosx+1,求f(x)的解析式
若函數(shù)f(tanx)=sin2x+sinxcosx+1,求f(x)的解析式
由于上課這題用換元法回答錯誤,老師讓我用換元法寫一遍,答案是f(x)=(2x²+x+1)/(x²+1)
由于上課這題用換元法回答錯誤,老師讓我用換元法寫一遍,答案是f(x)=(2x²+x+1)/(x²+1)
數(shù)學(xué)人氣:623 ℃時間:2020-01-27 07:55:04
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