sin^2x+2sinxcosx-3cos^2x=1 求sinx

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sin^2x+2sinxcosx-3cos^2x=1 求sinx
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sin^2x+2sinxcosx-3cos^2x=1 求sinx
sin^2x+2sinxcosx-3cos^2x=1 求sinx

sin^2x+2sinxcosx-3cos^2x=1 求sinx
sin^2x+2sinxcosx-3cos^2x=1
2sinxcosx-4cos^2x=0
sinxcosx=2cos^2x
cosx（sinx-2cosx）=0
（1）cosx=0,sinx=±1
（2）sinx=2cosx
tanx=2
tan^x+1=5
1/cos^x=5
cos^x=1/5
sin^x=4/5
sinx=±2√5/5

2sin平方x +cos平方x+3sinxcosx化简 2根号3sinxcosx+2sin^2x的值域 cos^2+2sinxcosx+sin^2x 函数y=sinxcosx-3sin^2(x)的最大值 sin 2x为何等于2sinxcosx 化简sin(2x+π/3)-（根号3）sin²x+sinxcosx+(根号3)/2 已知sin(3pai-x)=-2sin(pai/2+x),则sinxcosx等于 已知tanx=2,则(1)1/4sin方x-3sinxcosx/cos方x+2sinxcosx tanx=2,则1/4sin²x-3sinxcosx/cos²x+2sinxcosx=多少 已知tanX=2求2sin^2X+sinXcosX-3cos^2X12333333333333333333333已知tanX=2求2sin^2X+sinXcosX-3cos^2X f(x)=sin^2x+sinxcosx-1/2,化简 y=(cos^2x)/(sinxcosx-sin^2x),(0 sin²X-sinxcosx+2cos²x=化简 sin²x+sinxcosx+2cos²x= f(x)=sin^2x+sinxcosx 如何化简 化简cos^4x-2sinxcosx-sin^4x f(x)=sin(x^2)+(√3)sinxcosx+2cos(x^2) 化简 f(x)=sin(x^2)+(√3)sinxcosx+2cos(x^2) 化简