T ily (sin f3 - sin a) = T .ly (tan f3 - tan a) = T~)'
Chapter 12, Problem 12.7(choose chapter or problem)
T ily (sin f3 - sin a) = T .ly (tan f3 - tan a) = T~)' [ux(x + ~X, )'1) - ux(X, )'2)] where subscripts x denote partial derivative~ and Yl and .\'2 are values between), and )' + .ly. Similarly. the resultant of the vertical components of the forces acting on the other two sides of the portion is
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