cosin2x-√3sin2x+2怎么解？？？？跪求
如图
绛旓細濡傚浘
绛旓細=cosx路sinx+鈭3cos²x-鈭3sin²+sinx路cosx =鈭3锛坈os²x-sin²x锛+2路sinx路cosx =鈭3cos2x-sin2x =2sin锛2x+蟺/3锛夆憼鏈灏忔鍛ㄦ湡T=2蟺/2=蟺 鈶锛坸锛夊彇寰楁渶澶у兼椂锛2x+蟺/3=蟺/2+2k蟺锛坘鈭圸锛夎В寰楋細x=k蟺+锛埾/12锛夛紙k鈭圸锛塮锛坸锛夊彇寰楁渶灏忓...
绛旓細璇佹槑cec2x - cot2x = tan x 璇佹槑锛氬乏杈=1/sin2x-cos2x/sin2x=(1-cos2x)/sin2x =(2sin²x)/(2sinxcosx)=(sinx)/(cosx)=tanx=鍙宠竟銆
绛旓細锛1锛 f(x)=2sin(2x+ 蟺 6 )+1-m 锛屸埓 m=2sin(2x+ 蟺 6 )+1 鍦 [0锛 蟺 2 ] 鍐呮湁瑙ｂ埖 0鈮鈮 蟺 2 锛屸埓 蟺 6 鈮2x+ 蟺 6 鈮 7蟺 6 鈭 0鈮2sin(2x+ 蟺 6 )+1鈮3 锛屸埓0鈮鈮3锛2...
绛旓細姝ｅ鸡銆佷綑寮﹀嚱鏁扮殑鍛ㄦ湡涓2蟺,姝ｅ垏鍑芥暟鍛ㄦ湡涓合鍏堟妸鎵姹傜殑涓夎鍑芥暟鍖栨垚鎴戜滑姣旇緝鐔熸倝鐨勫舰寮忥紝鍙互鐩存帴浠ｅ叆浠ヤ笅鍏紡銆傛瘮濡傝鍙寲鎴 y锛sin锛埾墄锛嬑革級锛婯锛屽垯T锛2蟺锛徬夛紱y锛漜os锛埾墄锛嬑革級锛婯锛屽垯T锛2蟺锛徬夛紱y锛漷an锛埾墄锛嬑革級锛婯锛屽垯T锛澫锛徬夛紱锛堝叾涓夛紝胃锛屜夊潎涓哄疄鏁帮級f锛坸锛夛紳sin...
绛旓細1.f(x)=sinx+鈭3cosx=鈭(1+3)sin(x+蟺/3)=2sin(x+蟺/3)鏈澶у兼槸ymax=2,鏈灏忓兼槸ymin=-2 2.y=cos²x-sin²x=cos2x 鎵浠ユ渶灏忔鍛ㄦ湡鏄疶=2蟺/2=蟺 3.宸茬煡sin 伪 - 2 cos 伪 / 3 sin 伪 + 5 cos 伪???鏉′欢鏄粈涔堬紵
绛旓細璇佹槑cec2x - cot2x = tan x 璇佹槑锛氬乏杈=1/sin2x-cos2x/sin2x=(1-cos2x)/sin2x =(2sin²x)/(2sinxcosx)=(sinx)/(cosx)=tanx=鍙宠竟.
绛旓細鍥炵瓟锛歽=sin(2x)-co(2x) =鈭2sin(2x-蟺/4) 鏈灏忔鍛ㄦ湡=蟺
绛旓細浣犲ソ锛氳В锛氱敱棰樻剰鍙緱蠅 锛0,T=蟺 f锛坸锛=2cos蠅x+2鈭3 sin蠅x+1=2(cos蠅x+鈭3 sin蠅x)+1=4(1/2cos蠅x+鈭3 /2sin蠅x)+1 =4sin(蠅x+蟺/6)+1 鍙堢煡T=2蟺/蠅=蟺 鍗 蠅=2 鍒 f锛坸锛=4sin(2x+蟺/6)+1 锛1锛夊綋 x鈭圼0锛屜/2]鏃讹紝0鈮2x鈮は锛屜/6鈮2x...
绛旓細锛1锛 f(x)=sin2x- 3 cos2x=2sin(2x- 蟺 3 ) 锛涒︼紙4鍒嗭級鍥 x鈭圼 蟺 4 锛 蟺 2 ] 锛屾墍浠 蟺 6 鈮2x- 蟺 3 鈮 2蟺 3 锛涘綋 x= 蟺 4 鏃讹紝 f(x ) min =f( 蟺 4 )=1 鈥︼紙6鍒...
