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Calculus: Fundamental Theorems & Definite Integrals

1. Executive Conceptual Abstract

Calculus formalizes continuous rates of change and quantitative area accumulation under functions via the Fundamental Theorem of Calculus:

ddx[∫axf(t) dt]=f(x)\frac{d}{dx} \left[ \int_{a}^{x} f(t)\,dt \right] = f(x)

2. Core Derivations & Evaluation Rule

Let F′(x)=f(x)F'(x) = f(x). The net accumulation over any closed interval [a,b][a, b] evaluates to the upper bound minus lower bound antiderivative:

∫abf(x) dx=F(b)−F(a)\int_{a}^{b} f(x)\,dx = F(b) - F(a)

3. Integration by Parts Product Decomposition

Derived directly from the differential product rule d(uv)=u dv+v dud(uv) = u\,dv + v\,du:

∫u dv=uv−∫v du\int u \, dv = u v - \int v \, du

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