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What is the formal definition of a derivative?

The formal definition of derivative of a function y=f(x) is: yโ€™=limฮ”xโ†’0f(x+ฮ”x)โˆ’f(x)ฮ”x. The meaning of this is best understood observing the following diagram: The secant PQ represents the mean rate of change ฮ”yฮ”x of your function in the interval between x and x+ฮ”x . . Similarly one may ask, what is the definition of a derivative โ€ฆ

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How can I get a flat stomach in a day without exercise?

12 ways to get a flatter stomach without exercise ordiet Perfect your posture. Straighten up and your figure looksbetter right away, advises American trainer Kim Lyons, who works onthe US show of The Biggest Loser. Drink up. Keep those fluids coming! Eat more H20. Reach for the almonds. Brew some coffee. Power up your breakfast. โ€ฆ

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