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

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