sin2x-cos2x=0图怎么画 函数y=x（sin2x-cos2x）的图象关于______对...
sin(2x)-cos(2x)=0 \u8fd9\u9898\u600e\u4e48\u505a?\u770b\u56fe\u89e3\u9898\u8fc7\u7a0b\uff1a
\u2235y=f\uff08x\uff09=x\uff08sin2x-cos2x\uff09=-xcos2x\uff0c\u2234f\uff08-x\uff09=-\uff08-x\uff09cos\uff08-2x\uff09=xcos2x=-\uff08-xcos2x\uff09=-f\uff08x\uff09\uff0c\u2234\u51fd\u6570y=x\uff08sin2x-cos2x\uff09\u4e3a\u5947\u51fd\u6570\uff0c\u2234\u5176\u56fe\u8c61\u5173\u4e8e\u539f\u70b9\uff080\uff0c0\uff09\u5bf9\u79f0\uff0c\u6545\u7b54\u6848\u4e3a\uff1a\uff080\uff0c0\uff09\uff0e
sin2x-cos2x=0⇒sin2x=cos2x⇒tan2x=1（x≠π/2）为一个方程，若真的有图像的话，也该为一个点。（你是不是要问sin2x-cos2x=f（x）的图像怎么画啊？）绛旓細鐪嬪浘瑙ｉ杩囩▼锛
绛旓細鐪嬪浘瑙ｉ杩囩▼锛
绛旓細sin2x^2+cos2x^2=1 鈭磗in2x=cos2x=鏍瑰彿2/2 鈭2x=n*pi+pi/4锛坣涓烘暣鏁帮級鈭磝=n*pi/2+pi/8
绛旓細sin2x-cos2x=0⇒sin2x=cos2x⇒tan2x=1锛坸鈮犗/2锛変负涓涓柟绋嬶紝鑻ョ湡鐨勬湁鍥惧儚鐨勮瘽锛屼篃璇ヤ负涓涓偣銆傦紙浣犳槸涓嶆槸瑕侀棶sin2x-cos2x=f锛坸锛夌殑鍥惧儚鎬庝箞鐢诲晩锛燂級
绛旓細瑙ｅ寲绠鏄牴2sin(x-鍏/4)
绛旓細灞曞紑鍖栬В寰(cosx-sinx)^2=2sinx*sinx 鎵浠osx-sinx=姝ｈ礋鏍逛簩sinx tanx=1/(1鍔犲噺鏍逛簩)
绛旓細鏍规嵁y=cosx涓巠=sinx鐨勫浘鍍忕劍鐐瑰彲寰楋紝绛旀涓簒=蟺/4+K蟺銆2銆佸皢cosx绉昏嚦鍙宠竟锛屽緱sinx-cosx=0锛屽彉褰㈠緱锛屽彿2涔樹互sin锛圶-蟺/4锛夌瓑浜0锛屽嵆sin锛圶-蟺/4锛=0锛屽嵆X-蟺/4绛変簬K蟺锛屽彲寰楃瓟妗堛3銆佷袱杈瑰钩鏂癸紙2鏄簩娆℃柟鐨勬剰鎬濓級锛sin2x-cos2x=0锛屾湁sin2x+cos2x=1锛屽嵆鍙緱鍒癱osx=asinx鐨勮В銆
绛旓細y =sin2x-cos2x =鈭2.sin(2x-蟺/4)
绛旓細cos2x=sin2x 鎵浠os2x=sin2x=卤鏍瑰彿2/2 2x=2k蟺+蟺/4 x=k蟺+蟺/8 鎴2x=2k蟺-蟺/4 x=k蟺-蟺/8
绛旓細浠呬緵鍙傝
