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1919 19全部展开收起tana=2tana/2/(1-tan^2a/2)=2*2/(1-2^2)=-4/3tan(a+π/4)=(tana+tanπ/4)/(1-tanatanπ/4)=
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tana=2tana/2 / (1-tan^2 a/2)=2*2/(1-2^2)=-4/3
tan(a+π/4)=(tana+tanπ/4)/(1-tanatanπ/4)=(-4/3+1)/(1+4/3)=-1/7
6sina+cosa/3sina-2cosa=(6tana+1)/(3tana-2)=(-8+1)/(-4-2)=7/6
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