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本筆記收錄各大三角函數的恆等式供讀者參考使用 每集有15題恆等式，每題均附證明方式供讀者練習 註： 1.不要看了不按讚喔☺☺，並留存❤ 2.追蹤我，以及時觀看我的筆記😊😊 3.不懂的地方歡迎至以下留言👇
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