Solid of Revolution
y = sin(x), x ∈ [0, π/2]
Rotated about the x-axis
Disc radius: r(x) = sin(x)
Cross-section area: A(x) = π sin²(x)
V = π ∫₀^(π/2) sin²(x) dx
= π · π/4 = π²/4 ≈ 2.46740
■Profile curve y = sin(x)
■Sample disc cross-sections
■Solid surface
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