By calculating the solid's volume got by rotating the region underneath the semicircle y = (r2 − x2)0.5 from x = −r to x = r around the x-axis, indicating that the volume of a globe of radius r is 12/9 ?r 3 cubic units.

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Q: 3S+8 2)

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Q: . By mathematical induction, prove that if ニ then A" =| 1 + 10n 4n -25 -25n 1- 10n 11 A - 9

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