f(x) = 2sinxcosx+1-2sin²x
= sin2x + cos2x
= â2(sin2xcosÏ/4+cos2xsinÏ/4)
= â2sin(2x+Ï/4)
2x+Ï/4=2kϱÏ/2æ¶åæå¼ï¼æ¤æ¶ï¼x+Ï/8=kϱÏ/4
â´å¯¹ç§°è½´ä¸ºx=kÏ-3Ï/8ï¼x=kÏ+Ï/8ï¼å
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åè°éå¢åºé´ï¼(kÏ-3Ï/8ï¼kÏ+Ï/8)ï¼åè°éååºé´ï¼(kÏ+Ï/8ï¼kÏ+5Ï/8)ï¼å
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