sin270°等于多少,怎么算 sin270度等于几
sin270\u00b0\u7b49\u4e8e\u591a\u5c11sin270\u00b0
=sin(360\u00b0-90\u00b0)
=sin(-90\u00b0)
=-sin(90\u00b0)
=-1
sin270=sin(-90+360)=-sin90=-1
sin270°=sin(90°+180°)=-sin90°=-1(诱导公式)希望对你有所帮助 还望采纳~~
刚好与Y轴重合,指向Y的负方向,按照单位圆:-1
sin270°等于sin 180+90=-sin90=-1
sin270°
=sin(360°-90°)
=sin(-90°)
=-sin(90°)
=-1
sin270=sin(360-90)=sin(2派-派/2)=sin派/2=-1
绛旓細sin270搴绛変簬璐1锛岃绠杩囩▼鏄sin270掳=sin锛90掳+180掳锛=-sin90掳=-1銆俿inx鍑芥暟锛屽嵆姝e鸡鍑芥暟锛屾槸涓夎鍑芥暟鐨勪竴绉嶃傚浜庝换鎰忎竴涓疄鏁皒閮藉搴旂潃鍞竴鐨勮锛堝姬搴﹀埗涓瓑浜庤繖涓疄鏁帮級锛岃岃繖涓鍙堝搴旂潃鍞竴纭畾鐨勬寮﹀約inx锛屾墍浠ュ浜庝换鎰忎竴涓疄鏁皒閮芥湁鍞竴纭畾鐨勫約inx涓庡畠瀵瑰簲锛屾寜鐓ц繖涓搴旀硶鍒欐墍寤虹珛...
绛旓細鍥犱负姝e鸡鍑芥暟鍦ㄧ涓锛岀浜岃薄闄愰兘鏄鏁帮紝鍦ㄧ涓夈佺鍥涜薄闄愰兘鏄礋鏁般傜涓璞¢檺浠0澧炲姞鍒1锛岀浜岃薄闄愪粠1鍑忓皬鍒0锛岀涓夎薄闄愪粠0鍑忓皯鍒拌礋1锛岀鍥涜薄闄愪粠璐1澧炲姞鍒0锛屾墍浠ユ寮270搴︽槸璐熶竴銆
绛旓細1銆佹寮︼細sin0掳=sin180掳=sin360掳=0锛宻in90掳=1锛宻in270掳=-1 2銆佷綑寮︼細cos0掳=cos360掳=1锛宑os90掳=cos270掳=0锛宑os180掳=-1 3銆佹鍒囷細tan0掳=tan180掳=tan360掳=0锛宼an90掳鍜宼an270掳鏃犳剰涔夈
绛旓細sin270搴︼紳sin锛-90锛夊害锛-sin90搴︼紝鎵浠绛変簬-1
绛旓細鍥犱负鍙互鐢绘潯sin x 鐨勬洸绾垮浘锛屽彂鐜皊in 0=0锛宻in 90=1锛宻in 180=0锛宻in 270=-1 锛宻in 360=1銆
绛旓細濡備笂鍥炬墍绀恒
绛旓細sin0掳=0锛泂in90掳=1锛泂in180掳=0锛sin270掳=-1锛泂in360掳=0锛沜os0掳=1锛沜os90掳=0锛沜os180掳=-1锛沜os270掳=0锛沜os360掳=1锛泃an0掳=0锛泃an90掳=1锛泃an180掳=0锛泃an360掳=0锛泃an270掳涓嶅瓨鍦紝270º涓嶆槸tan鍑芥暟鐨勫畾涔夊煙銆
绛旓細浣犲ソ锛氭寮270搴 =sin270 =sin(180+90)=-sin90 =-1 鎰垮浣犳湁甯姪锛
绛旓細sin0掳=0锛泂in90掳=1锛泂in180掳=0锛sin270掳=-1锛泂in360掳=0锛沜os0掳=1锛沜os90掳=0锛沜os180掳=-1锛沜os270掳=0锛沜os360掳=1锛泃an0掳=0锛泃an90掳=1锛泃an180掳=0锛泃an360掳=0锛泃an270掳涓嶅瓨鍦紝270º涓嶆槸tan鍑芥暟鐨勫畾涔夊煙銆傝祫鏂欐嫇灞曪細1銆佷笁瑙掑嚱鏁版槸鍩烘湰鍒濈瓑鍑芥暟涔嬩竴锛屾槸浠ヨ搴︿负...
绛旓細sin0掳锛宻in90掳锛宻in180掳锛宻in270掳锛sin360掳鐨勫畾涔夎窡鍏朵竴鑸殑瑙捨辩殑瀹氫箟涓鏍枫傚湪鐩磋鍧愭爣绯讳腑锛屼互鍘熺偣涓哄渾蹇冿紝浠=1 涓哄崐寰勪綔涓涓渾銆傝伪缁堣竟涓庡渾鐨勪氦鐐逛负P(x,y)銆傚畾涔夛細sin伪 = y/r 銆備緥濡傦細sin30掳 = y/r = 1/2銆俿in0掳 = y/r = 0/1 = 0銆俿in90掳= y/r = 1/1...