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[qquad (1)/(dx)=(cos(x+y)+x sin y)/(cos(...

[qquad (1)/(dx)=(cos(x+y)+x sin y)/(cos(x+y)+x sin y)],[" xample "7." If "x sin(a+y)+sin a cos(a+y)=0," prove that "(dy)/(dx)=(sin^(2)(a+y))/(sin a)]

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