math: fix solid revolution formula
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@ -126,7 +126,7 @@ Shapes formed by rotating a line or curve about a fixed axis, such as cones, sph
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\begin{align*}
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\begin{align*}
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V&=\lim_{x\to 0}\sum^b_{x=a}\pi y^2 dx \\
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V&=\lim_{x\to 0}\sum^b_{x=a}\pi y^2 dx \\
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&=\int^b_a y^2 dx
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&=\pi\int^b_a y^2 dx
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\end{align*}
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\end{align*}
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$$
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$$
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