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tan¥è °ªÀ» ¾Ë ¶§, (sec¥è)^2 °ª ±¸Çϱâ

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tan¥è = n ÀÏ ¶§, (sec¥è)^2 °ªÀº ´ÙÀ½°ú °°ÀÌ ±¸ÇÒ ¼ö ÀÖ´Ù.

tan¥è = sin¥è/cos¥è = n À̹ǷÎ,

cos¥è = sin¥è / n

(cos¥è)^2 = (sin¥è / n)^2 = (1-(cos¥è)^2) / n^2

n^2*(cos¥è)^2 = 1-(cos¥è)^2

(cos¥è)^2 = 1/(n^2 + 1)

(sec¥è)^2 = 1/(cos¥è)^2 = (n^2 + 1)

*** Âü°í¹®Çå[References] ***

(sec¥è)^2 = (n^2 + 1)
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