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Show that the semi-vertical angle of the...

Show that the semi-vertical angle of the cone of the maximum volume and of given slant height is `cos^(-1)1/(sqrt(3))`

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The correct Answer is:
`cos^(-1) ((1)/(sqrt(3)))`
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OSWAAL PUBLICATION-APPLICATIONS OF DERIVATIVES-TOPIC - 5 MAXIMA AND MINIMA (LONG ANSWER TYPE QUESTIONS - II)
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