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the subject ![\theta =sin^{-1} [ \frac{ F_b }{I * l * B } ]](/tpl/images/0716/8758/1129b.png)
![\theta =sin^{-1} [ \frac{ 0.18 }{ 2.0 * 0.6 * 0.3 } ]](/tpl/images/0716/8758/004d5.png)
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