1、Sin^2x-3sinxcosx+1=02、(1-sin^2x)^1/2=sinx
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1、Sin^2x-3sinxcosx+1=02、(1-sin^2x)^1/2=sinx
1、Sin^2x-3sinxcosx+1=0
2、(1-sin^2x)^1/2=sinx
1、Sin^2x-3sinxcosx+1=02、(1-sin^2x)^1/2=sinx
1、sin²x-3sinxcosx+sin²x+cos²x=0,所以2sin²x-3sinxcosx+cos²x=0
所以(sinx-cosx)(2sinx-cosx)=0,所以sinx=cosx或2sinx=cosx
所以tanx=1或1/2, x=kπ+π/4,k∈Z或x=kπ+arctan1/2.
2、(cos²x)^(1/2)=sinx,所以cosx=sinx或-cosx=sinx
所以tanx=1或-1,x=kπ+π/4或x=kπ-π/4.
1、Sin^2x-3sinxcosx+1=0
Sin^2x-3sinxcosx+sin^2x+cos^2x=0
2Sin^2x-3sinxcosx+cos^2x=0
(2sinx-cosx)(sinx-cosx)=0
2sinx-cosx=0 sinx-cosx=0
x=arctan1/2 或 x=2kπ+π/4
2、(1-sin^2x)^1/2=sinx
1-sin^2x=sin^2x
sin^2x=1/2
sinx=±根号2/2
x=kπ+π/4
由于我在上课,不方便给你解答,不过我给你提供一个思路,你可以试试。换元法
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