a math question of matrix

[Shih Lin]

Dear octave or matlab user:

  In book Matlab for Engineers written by Adrian Biran and Moshe Breiner, 
page 269 (6.35), why the third row
(0 l*(tan(alpha)+mu)  -W) *(r1 r2 l0) = mu
that was dirived from inequality (6.33) l(tan(apha)+mu)*r2 > l0*W
, especially why the right hand side is mu?

hope to get some one ever reading that book 's hint and thanks in advance
eric
address@hidden
address@hidden

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