sin2x等于什么？？ sin2x等于什么 sin4x等于什么
sin2x\u7b49\u4e8e\u591a\u5c11\uff1fsin2x=2sinxcosx,
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sin\uff08x+y\uff09=sinxcosy+cosxsiny \u5f97\u5230\u3002
\u6b64\u5916\uff0c\u8fd8\u6709\u51e0\u4e2a\u4e09\u89d2\u6052\u7b49\u5f0f\uff1a
cos\uff08x+y\uff09=cosxcosy-sinxsiny
cos\uff08x-y\uff09=cosxcosy+sinxsiny
sin\uff08x-y\uff09=sinxcosy-cosxsiny
tan\uff08x+y\uff09=\uff08tanx+tany\uff09/\uff081-tanxtany\uff09
tan\uff08x-y\uff09=\uff08tanx-tany\uff09/\uff081+tanxtany\uff09
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\u53ea\u9700\u5c06\u548c\u89d2\u516c\u5f0f\u4e2d\u7684y\u66ff\u6362\u4e3ax\u5373\u53ef\u3002
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sin2x=2sinxcosx
sin4x=2sin2xcos2x
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SIN2X等于2sinxcosx
2sinxcosx
2SINXCOSX
绛旓細sin2x=2sinxcosx銆傚垎鏋愯繃绋嬪涓嬶細sin(伪+尾)=sin伪cos尾+ sin尾cos伪 sin(伪-尾)=sin伪cos尾-sinB*cos伪 鏍规嵁sin(伪+尾)=sin伪cos尾+ sin尾cos伪鍙緱锛歴in2x=sin锛坸+x锛=sinxcosx+sinxcosx=2sinxcosx 甯哥敤鍏紡锛氬叕寮忎竴锛氳伪涓轰换鎰忚锛岀粓杈圭浉鍚岀殑瑙掔殑鍚屼竴涓夎鍑芥暟鐨勫肩浉绛夛細sin锛2k蟺+...
绛旓細sin2x=2sinxcosx銆傚垎鏋愯繃绋嬪涓嬶細sin(伪+尾)=sin伪cos尾+ sin尾cos伪 sin(伪-尾)=sin伪cos尾-sinB*cos伪 鏍规嵁sin(伪+尾)=sin伪cos尾+ sin尾cos伪鍙緱锛歴in2x=sin锛坸+x锛=sinxcosx+sinxcosx=2sinxcosx
绛旓細杩欏叾瀹炴槸鐢变袱瑙掑拰鐨勬寮﹀叕寮忥紝鐢眘in (xty)=sinxcosy+cosxsiny寰楀埌锛鎵浠in2x绛変簬2sinxcosx銆傚湪璁＄畻涓彲浠ョ敤鏉ュ寲绠璁＄畻寮忋佸噺灏戞眰涓夎鍑芥暟鐨勬鏁帮紝鍦ㄥ伐绋嬩腑涔熸湁骞挎硾鐨勮繍鐢紝璇ュ叕寮忔槸涓夎鍑芥暟涓潪甯稿疄鐢ㄧ殑涓绫诲叕寮忋傚嶈鍏紡锛屾槸涓夎鍑芥暟涓潪甯稿疄鐢ㄧ殑涓绫诲叕寮忋傚氨鏄妸浜屽嶈鐨勪笁瑙掑嚱鏁扮敤鏈鐨勪笁瑙掑嚱鏁拌〃绀...
绛旓細sin2x绛変簬2sinxcosx銆傝繖鍏跺疄鏄敱涓よ鍜岀殑姝ｅ鸡鍏紡sin(x+y)=sinxcosy+cosxsiny寰楀埌銆傛澶栵紝杩樻湁鍑犱釜涓夎鎭掔瓑寮廲os(x+y)=cosxcosy-sinxsinycos(x-y)=cosxcosy+sinxsinysin(x-y)=sinxcosy-cosxsinytan(x+y)=(tanx+tany)/(1-tanxtany)tan(x-y)=(tanx-tany)/(1+tanxtany)鎯虫帹瀵煎嚭鍚勭浜屽...
绛旓細sin2x=2sinxcosx.甯屾湜閲囩撼鈥︹﹁阿璋⑩︹﹀涔犺繘姝モ︹
绛旓細sin2x=2sinxcosx,杩欏叾瀹炴槸鐢变袱瑙掑拰鐨勬寮﹀叕寮 sin锛坸+y锛=sinxcosy+cosxsiny 寰楀埌銆傛澶栵紝杩樻湁鍑犱釜涓夎鎭掔瓑寮忥細cos锛坸+y锛=cosxcosy-sinxsiny cos锛坸-y锛=cosxcosy+sinxsiny sin锛坸-y锛=sinxcosy-cosxsiny tan锛坸+y锛=锛坱anx+tany锛/锛1-tanxtany锛塼an锛坸-y锛=锛坱anx-tany锛/锛1+tanx...
绛旓細sinx涔榗osx=(1/2)sin2x銆傝绠楄繃绋嬪涓嬶細2sinxcosx =sin2xsinxcosx =1/2sin2x 绉殑鍏崇郴锛歴in伪 = tan伪 脳 cos伪锛堝嵆sin伪 / cos伪 = tan伪 锛塩os伪 = cot伪 脳 sin伪 锛堝嵆cos伪 / sin伪 = cot伪锛塼an伪 = sin伪 脳 sec伪 (鍗 tan伪 / sin伪 = sec伪)鐩稿叧淇℃伅锛氬父瑙佺殑涓夎...
绛旓細sin2x=2sinxcosx
绛旓細sin2x=2sinxcosx
绛旓細濡傛灉X鏄涓涓搴︾殑璇濓紝閭ｄ箞瀹冪殑鍘熷叕寮忔槸锛歴in锛圶+Y锛=sinXcosY+cosXsinY 浠=Y 閭ｄ箞锛sin2X=2sinXcosX
