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[" 23.If "cos y=x*cos(a+y)" then "(dy)/(...

[" 23.If "cos y=x*cos(a+y)" then "(dy)/(dx)=],[[" 1."(cos^(2)(a+y))/(sin a)," 2."(cos^(2)(a+y))/(cos a)],[" 3."(cos a)/(sin^(2)(a+y))," 4."(cos(a+y))/(sin a)]]

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