A force of 40 N is required to hold a spring that has been stretched from its natural length of 10 cm to a length of 15 cm. How much work is done in stretching the spring from 15 cm to 18 cm?

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Q: Q3: A) Solve: B) Solve: The differential equation: x³y + 3xy" + xy' +8y=1/ (x² + 3y2)dx-2xy dy

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