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المساحات والحجوم: Mathematics Tawjihi question with answer

A Tawjihi Mathematics question (التكامل) with the answer and worked steps.

From the Tawjihi question bank: Mathematics · التكامل

أجد حجم المجسم الناتج من دوران المنطقة تحت f(x)=exf(x)=e^x حول المحور xx على الفترة [1,2][-1,2].

المساحات والحجوم

The answer

قانون الأقراص: V=π12(ex)2dx=π12e2xdx=π2[e2x]12=π2(e4e2)V=\pi\int_{-1}^2(e^x)^2dx=\pi\int_{-1}^2e^{2x}dx=\frac{\pi}{2}\left[e^{2x}\right]_{-1}^2=\frac{\pi}{2}(e^4-e^{-2}) وحدة مكعبة.

Explanation

مثال حجم دوران تحت منحنى واحد حول محور xx.

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