tan(a+π/4)=2,则cos2a+3sin^2a+tan a=
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tan(a+π/4)=2,则cos2a+3sin^2a+tana=tan(a+π/4)=2,则cos2a+3sin^2a+tana=tan(a+π/4)=2,则cos2a+3sin^2a+tana=t
tan(a+π/4)=2,则cos2a+3sin^2a+tan a=
tan(a+π/4)=2,则cos2a+3sin^2a+tan a=
tan(a+π/4)=2,则cos2a+3sin^2a+tan a=
tan(a+π/4)=2
tana=1/3
sin^2a=1/10
cos2a+3sin^2a+tan a
=1-2sin^2a+3sin^2a+tan a
=1+sin^2a+tan a
=1+1/10+1/3
=43/30
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