3π/4

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3π/4
3π/4

3π/4
3π/4tan3π/4-1tana+1/tana=-10/3
3tan²a+10tana+3=0
(3tana+1)(tana+3)=0
-1tana=-1/3

tanα+cotα=-10/3
tanα+(1/tanα)=-10/3
tanα=-3 或tanα=-1/3
因为3π/4所以tanα=-1/3

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