(1+tan13) (1+tan32) /(1+tan12) (1+tan33)
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(1+tan13) (1+tan32) /(1+tan12) (1+tan33)
(1+0.23)(1+0.62)/(1+0.21)(1+0.65)
(1.23)(1.62)/(1.21)(1.65)
1.9926/1.9965
0.99
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