(1+tanα)/(1-tanα)=2013,则1/cos2θ+tan2θ=?

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(1+tanα)/(1-tanα)=2013,则1/cos2θ+tan2θ=?

(1+tanα)/(1-tanα)=2013,则1/cos2θ+tan2θ=?
(1+tanα)/(1-tanα)=2013,则1/cos2θ+tan2θ=?

(1+tanα)/(1-tanα)=2013,则1/cos2θ+tan2θ=?
1/cos2α+tan2α =(1+tanα^2)/(1-tanα^2)+2tanα/(1-tanα^2) =(1+tanα^2+2tanα/(1-tanα^2) =(1+tanα)^2/[(1-tanα0(1+tanα)] =(1+tanα)/(1-tanα)=2013