sin120°等于cos多少 为什么sin120度等于cos3o度

cos120\u00b0\u600e\u4e48\u7b97\uff1f

cos120\u00b0\uff1d\uff0d0.5\uff0c\u8ba1\u7b97\u8fc7\u7a0b\uff1a
\u6839\u636e\u4efb\u610f\u89d2\u4e09\u89d2\u51fd\u6570\u7b97\u8bf1\u5bfc\u516c\u5f0fcos\uff08180\u00b0\uff0d\u03b1\uff09\uff1dcos\uff08\uff0d\u03b1\uff09
\u6240\u4ee5cos120\u00b0\uff1dcos\uff08180\u00b0\uff0d60\u00b0\uff09\uff1d\uff0dcos60\u00b0\uff1d\uff0d0.5
\u56e0\u4e3a\u8868\u793a120\u00b0\u7684\u89d2\u7684\u7ec8\u8fb9\u5728\u7b2c\u4e8c\u8c61\u9650\uff0c\u6240\u4ee5\u4f59\u5f26\u503c\u662f\u8d1f\u6570\u3002

\u6269\u5c55\u8d44\u6599\uff1a

\u4e09\u89d2\u51fd\u6570\u500d\u89d2\u516c\u5f0f\uff1a
1\u3001Sin2A\uff1d2SinA\uff0aCosA
2\u3001Cos2A\uff1dCosA\uff3e2\uff0dSinA\uff3e2\uff1d1\uff0d2SinA\uff3e2\uff1d2CosA\uff3e2\uff0d1
3\u3001tan2A\uff1d\uff082tanA\uff09\uff0f\uff081\uff0dtanA\uff3e2\uff09\uff08\u6ce8\uff1aSinA\uff3e2\u662fsinA\u7684\u5e73\u65b9sin2\uff08A\uff09\uff09
\u4e09\u89d2\u51fd\u6570\u8bf1\u5bfc\u516c\u5f0f
1\u3001\uff08\uff0d\u03b1\uff09\uff1d\uff0dsin\u03b1\u3001cos\uff08\uff0d\u03b1\uff09\uff1dcos\u03b1
2\u3001tan\uff08\u2014a\uff09\uff1d\uff0dtan\u03b1\u3001sin\uff08\u03c0\uff0f2\uff0d\u03b1\uff09\uff1dcos\u03b1\u3001cos\uff08\u03c0\uff0f2\uff0d\u03b1\uff09\uff1dsin\u03b1\u3001sin\uff08\u03c0\uff0f2\uff0b\u03b1\uff09\uff1dcos\u03b1
3\u30013cos\uff08\u03c0\uff0f2\uff0b\u03b1\uff09\uff1d\uff0dsin\u03b1
4\u3001\uff08\u03c0\uff0d\u03b1\uff09\uff1dsin\u03b1\u3001cos\uff08\u03c0\uff0d\u03b1\uff09\uff1d\uff0dcos\u03b1
5\u30015tanA\uff1dsinA\uff0fcosA\u3001tan\uff08\u03c0\uff0f2\uff0b\u03b1\uff09\uff1d\uff0dcot\u03b1\u3001tan\uff08\u03c0\uff0f2\uff0d\u03b1\uff09\uff1dcot\u03b1
6\u3001tan\uff08\u03c0\uff0d\u03b1\uff09\uff1d\uff0dtan\u03b1\u3001tan\uff08\u03c0\uff0b\u03b1\uff09\uff1dtan\u03b1

\u89e3\uff1asin120\u00b0=sin(90\u00b0+30\u00b0)
=cos30\u00b0 (\u5e94\u7528\u8bf1\u5bfc\u516c\u5f0f)\u3002
\u8bf4\u660e\uff1acos30\u00b0 =\u221a3/2\u3002

sin120°等于cos（30°+k×360°）或cos（-30°+k×360°）
其中k为任意整数

60

30度

cos（k×360+30）

30度

sin120掳绛変簬cos澶氬皯
绛旓細sin120掳绛変簬cos锛30掳+k脳360掳锛夋垨cos锛-30掳+k脳360掳锛夊叾涓璳涓轰换鎰忔暣鏁

sin120掳绛変簬cos澶氬皯
绛旓細sin120掳绛変簬cos锛30掳+k脳360掳锛夋垨cos锛-30掳+k脳360掳锛夊叾涓璳涓轰换鎰忔暣鏁

涓轰粈涔sin120搴绛変簬cos3o搴
绛旓細瑙ｏ細sin120掳=sin(90掳+30掳)=cos30掳 (搴旂敤璇卞鍏紡)銆璇存槑锛歝os30掳 =鈭3/2銆

涓轰粈涔sin120绛変簬cos30
绛旓細sin(蟺/2+30)=sin(蟺/2-30)=cos30

120搴︾殑涓夎鍑芥暟鍊兼槸浠涔?
绛旓細120搴︾殑涓夎鍑芥暟鍊兼槸锛sin120=浜屽垎涔嬫牴鍙蜂笁锛cos120搴=璐1/2锛宼an120搴=璐熸牴鍙蜂笁銆傚父瑙佺殑涓夎鍑芥暟鍖呮嫭姝ｅ鸡鍑芥暟銆佷綑寮﹀嚱鏁板拰姝ｅ垏鍑芥暟銆傚湪鑸捣瀛︺佹祴缁樺銆佸伐绋嬪绛夊叾浠栧绉戜腑锛岃繕浼氱敤鍒板浣欏垏鍑芥暟銆佹鍓插嚱鏁般佷綑鍓插嚱鏁般佹鐭㈠嚱鏁般佷綑鐭㈠嚱鏁般佸崐姝ｇ煝鍑芥暟銆佸崐浣欑煝鍑芥暟绛夊叾浠栫殑涓夎鍑芥暟銆備笉鍚岀殑涓夎鍑芥暟...

涓夎鍑芥暟鍊煎垪涓〃缁欐垜銆傘傝阿
绛旓細sin110掳 = 0.939692620785908; cos110掳 = -0.342020143325669;tan110掳 = -2.74747741945462; cot110掳 = -0.363970234266202;sin115掳 = 0.90630778703665; cos115掳 = -0.422618261740699;tan115掳 = -2.14450692050956; cot115掳 = -0.466307658154998;sin120掳 = 0.866025403784439; cos120掳 = -0.5;tan120掳 = ...

涓夎鍑芥暟鍊煎鐓ц〃
绛旓細cos120=0.814锛cos120掳=-sin30掳 tan120=0.713锛泃an120掳=-tan60掳 sin135=0.088锛泂in135掳=sin45掳 cos135=-0.996锛沜os135掳=-cos45掳 tan135=-0.0887锛泃an135掳=-tan45掳 sin150=-0.7149锛泂in150掳=sin30掳 cos150=-0.699锛沜os150掳=-cos30掳 tan150=-1.022锛泃an150掳=-...

sin cos tan搴︽暟鍏紡
绛旓細涓銆sin搴︽暟鍏紡 1銆乻in 30= 1/2 2銆乻in 45=鏍瑰彿2/2 3銆乻in 60= 鏍瑰彿3/2 浜屻cos搴︽暟鍏紡 1銆乧os 30=鏍瑰彿3/2 2銆乧os 45=鏍瑰彿2/2 3銆乧os 60=1/2涓夈乼an搴︽暟鍏紡 1銆乼an 30=鏍瑰彿3/3 2銆乼an 45=1 3銆乼an 60=鏍瑰彿3

鎬庝箞绠楀綋瑙掔殑搴︽暟涓120搴︽椂鐨勪笁瑙掑嚱鏁
绛旓細绗竴绉嶆柟娉曪紝鏌ユ暟瀛︾敤琛紱绗簩绉嶆柟娉曪紝鍦ㄨ绠楀櫒涓婂厛鎸塻hift鍑忥紝鍐嶆寜涓夎鍑芥暟鍚嶏紝鍐嶈緭鍏ヤ笁瑙掑嚱鏁板硷紝鍗冲緱鍒拌鐨勫笺

涓夎鍑芥暟sin cos tan鍒嗗埆鍦120 135 150 180搴︾殑鍊兼槸澶氬皯 鎬ユユ!!!
绛旓細1銆sin120=鈭3锛2锛2銆cos120锛濓紞1锛2锛3銆乼an120锛濓紞鈭3锛4銆乻in135 锛濃垰2锛2锛5銆乧os135 锛濓紞鈭2锛2锛6銆乼an135锛濓紞1锛7銆乻in150锛1锛2锛8銆乧os150=锛嶁垰3锛2锛9銆乼an150 锛濓紞鈭3锛3锛10銆乻in 180锛0锛11銆乧os 180锛1锛12銆乼an 180锛0銆

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