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[y=12(1-cos t),quad x=10(1-sin t)],[" ( ...

[y=12(1-cos t),quad x=10(1-sin t)],[" ( "0" at "cos^(-1)((x^(2)-y^(2))/(x^(2)+y^(2)))=tan^(-1)a" and fired and for "(dy)/(dx)=(y)/(x)],[qquad [1vec x5]]

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