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Á÷»ç°¢ÇüÀÇ °¡·Î±æÀ̸¦ 2x, ¼¼·Î±æÀ̸¦ 2y¶ó Çϸé, ¸éÀû A = 4xy °¡ µÈ´Ù.

r^2 = x^2+y^2 À̹ǷΠy = (r^2 - x^2)^(1/2)

A = 4x(r^2 - x^2)^(1/2)

¸éÀû A¸¦ ¹ÌºÐÇϸé A¡Ç = 4*(r^2 - 2x^2)/(r^2 - x^2)^(1/2)

r^2-2x^2 = 0 ¿¡¼­ ÃÖ´ë°ªÀ» °¡Áö¹Ç·Î,

x = r/2^(1/2) ÀÌ°í y = x °¡ µÈ´Ù. (Á¤»ç°¢Çü)

µû¶ó¼­ ¸éÀû A ´Â ´ÙÀ½°ú °°´Ù.

A = 4*r/2^(1/2)*r/2^(1/2) = 2r^2

*** Âü°í¹®Çå[References] ***

A = 2*r^2
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