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(1/((-2x)/y^2 -15 e^-x cos(5y)))(((15 e^-x cos(5y))/(x)-(2x)/y^2)-(15 e^-x cos(5y)-2/(y^2)))
(1/((-2x)/y^2 -15 e^-x cos(5y)))(((15 e^-x cos(5y))/(x)-(2x)/y^2)-(15 e^-x cos(5y)-2/(y^2)))
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