若tan(α=四分之π)=七分之一则tanα=
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是tan(α+π/4)=1/7吧?
tan(α+π/4)
=[tanα+tan(π/4)]/[1-tanαtan(π/4)]
=(tanα +1)/(1-tanα)
=1/7
1-tanα=7(tanα+1)
1-tanα=7tanα+7
8tanα=-6
tanα=-3/4
tan(α+π/4)
=[tanα+tan(π/4)]/[1-tanαtan(π/4)]
=(tanα +1)/(1-tanα)
=1/7
1-tanα=7(tanα+1)
1-tanα=7tanα+7
8tanα=-6
tanα=-3/4
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