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(2) °ü·Ã ÆäÀÌÁö Âʼö : 130ÂÊ 6¹ø

(3) ¹®ÀÇ»çÇ× : ´äÁö º¸´Ï±î  cos²(⅔ㅠ- @) + 2cos²@ + 2sin(ㅠ+@) °¡ -(sin@)² + 2(1-sin²@) + 2(-sin@)°¡ µÈ´Ù°í Çϴµ¥¿ä. 2(1-sin²@) + 2(-sin@) À̺κÐÀº ÀÌÇØ°¡ °©´Ï´Ù¸¸ cos²(⅔ㅠ-@)ÀÌ  -(sin@)² ÀÌ·¸°Ô µÈ´Ù´Â°Ô ÀÌÇØ°¡ ¾È°¡³×¿ä. ¼³¸í Á» ÇØÁÖ¼¼¿ä. Ã¥ÀÌ Àß ¸ø ³ª¿Â°Ç°¡¿ä???? 


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ÇØ´ç ±³ÀçÀÇ Ç®ÀÌ¿¡´Â -(sin²θ)°¡ ¾Æ´Ï¶ó (-sinθ)²·Î ÀûÇôÀÖÀ¸¸ç ÀÌ¿ÜÀÇ ¿ÀŸ ¹× ¿À·ù´Â ¾ø½À´Ï´Ù. cos²(³/₂π-θ)¸¦ ´Ù½Ã ¾²¸é {cos(³/₂π-θ)}²·Î ¾µ ¼ö ÀÖÀ¸¸ç, À̶§ (³/₂π-θ)´Â 3»çºÐ¸éÀÇ °¢À̹ǷΠcos°ú sinÀÇ ºÎÈ£´Â ¸ðµÎ À½ÀÔ´Ï´Ù. µû¶ó¼­ cos(³/₂π-θ)=-sinθÀ̹ǷΠ{cos(³/₂π-θ)}²=(-sinθ)²ÀÔ´Ï´Ù.

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