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Maximum volume of a cylinder between the revolution of the quadratic function and the x-axis

ÀÛ¼ºÀÚ Uploader : cannon ÀÛ¼ºÀÏ Upload Date: 2019-11-10º¯°æÀÏ Update Date: 2022-06-16Á¶È¸¼ö View : 101

Maximum volume of a cylinder that can be made between the revolution of the quadratic function y = x^2 - a^2 and the x-axis can be found as follows.

The volume V of a cylinder that can be made is:

V = ¥ð*x^2*(-y)

 = ¥ð*x^2*(a^2 - x^2)

 = ¥ð*(a^2*x^2 - x^4)

When a^2*x^2 - x^4 is maximum, V becomes maximum.

Differentiate to find the maximum value,

2*a^2*x - 4*x^3 = 0

When x = (1/2)^(1/2)*a, V becomes maximum.

Vmax = ¥ð*((1/2)a^4 - (1/4)*a^4)

    = (¥ð/4)*a^4

*** Âü°í¹®Çå[References] ***

Vmax = (¥ð/4)*a^4
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