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Expert Answer
If a function y = f(x) in the range for a ≤ x ≤ b, is rotated about x axis then the surface area, S of the solid so generated is given by the formula shown on the whiteboard.
x = 9 - y2
when y = 1, x = 9 - 12 = 8
when y = 3, x = 9 - 32 = 0
Hence, a = 0 and b = 8
y = f(x) and f'(x) will be as shown on the white board.
Hence, the surface area, S will be evaluate...
Math
Calculus
Integration
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