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Use the integration symbol to denote the area under $f(x)=\sin(x)$ between $0$ and $\pi/2$ .

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Lesson Parent:

Problem:

Answer:

$\int_0^{\frac{\pi}{2}}\sin(x)\,dx$

Solution:

There is no math involved here. This is just to emphasize the notation. Our notation is that

So the area between $0$ and $\pi/2$ under the curve <Sign in to see all the formulas> would be denoted by