tan α= -(1/3),则sin^2 α+2sinα cosα-3cos^2 α=

来源:学生作业帮助网 编辑:六六作业网 时间:2024/12/24 10:09:52
tanα=-(1/3),则sin^2α+2sinαcosα-3cos^2α=tanα=-(1/3),则sin^2α+2sinαcosα-3cos^2α=tanα=-(1/3),则sin^2α+2sin

tan α= -(1/3),则sin^2 α+2sinα cosα-3cos^2 α=
tan α= -(1/3),则sin^2 α+2sinα cosα-3cos^2 α=

tan α= -(1/3),则sin^2 α+2sinα cosα-3cos^2 α=
(sinα-cosα)/(sinα+3cosα)=(tanα-1)/(tanα+3)=-32/9

(sinα+cosα)/(8sinα-8cosα)=(tanα+8)/(8tanα-8)=-8/8