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Answers for “$2x$ 的不定积分是什么?”

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To set up the integral for IyI_y using a vertical strip, first express the differential area dAdA in terms of xx. A vertical strip has an infinitesimal width dxdx and a height determined by the difference between the upper and lower boundary curves at position xx.

Conditions: The region is bounded by curves that can be expressed as functions of xx.; A vertical differential strip is chosen, meaning its width is dxdx.; The integration variable is xx.

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The indefinite integral is simply another name for the antiderivative. Both terms refer to the family of functions whose derivative is the given function, typically expressed with an arbitrary constant CC.

Conditions: The context is introductory calculus focusing on reverse differentiation.; The function is continuous or differentiable on the interval of interest.

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The notation ∫2x dx\int 2x \, dx is a compact way to ask for the antiderivative of 2x2x with respect to xx. It represents the entire family of functions whose derivative is 2x2x, which is written as x2+Cx^2+C.

Conditions: The variable of integration is xx.; The integrand is 2x2x.