sin(x)ãcos(x)å¨æ为2Ïï¼tan(x)å¨æ为Ïï¼sin(3Ïx)ãcos(3Ïx)å¨æ为2/3(3Ïxåå¼å¨0å°2Ïä¹é´æ¶ï¼xåå¼å¨0å°2/3ï¼æ
å
¶å¨æ为2/3ï¼ä½ä¸åç)ï¼tan(3Ïx)å¨æ为1/3ï¼sin(2x)ãcos(2x)å¨æ为Ïï¼tan(2x)å¨æ为Ï/2ã
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