sin5度的值 sin多少度 =4/5
\u4e3a\u4ec0\u4e48sin4\u5ea6\uff0csin5\u5ea6\u7684\u503c\u662f\u8d1f\u6570\u554a 4\uff0c5\u5728\u7b2c\u4e00\u8c61\u9650\u4e0d\u662f\u6b63\u5417\u7b2c\u4e00\u8c61\u9650\u662f0\u52303.14/2\uff1b\u7b2c\u4e8c\u8c61\u9650\u662f3.14/2\u52303.14\uff1b\u7b2c\u4e09\u8c61\u9650\u662f3.14\u52303.14*3/2\uff1b\u7b2c\u56db\u8c61\u9650\u662f3.14*3/2\u52303.14*2\u3002\u770b4\u5728\u90a3\u4e2a\u8303\u56f4\u5185\u5c31\u5728\u7b2c\u51e0\u8c61\u9650\u3002
\u8fd9\u91cc4\u5728\u7b2c\u4e09\u8c61\u9650
\u671b\u91c7\u7eb3\uff0c\u8c22\u8c22
\u5982\u4e0b \u671b\u91c7\u7eb3
sin15=sin（45-30）=sin45cos30-sin30cos45=（根号6-根号2）/4
sin15=sin5(1-2sin²5)-2sin5(1-sin²5)解出sin5
绛旓細绗竴璞￠檺鏄0鍒3.14/2锛涚浜岃薄闄愭槸3.14/2鍒3.14锛涚涓夎薄闄愭槸3.14鍒3.14*3/2锛涚鍥涜薄闄愭槸3.14*3/2鍒3.14*2銆傜湅4鍦ㄩ偅涓寖鍥村唴灏卞湪绗嚑璞￠檺銆傝繖閲4鍦ㄧ涓夎薄闄 鏈涢噰绾筹紝璋㈣阿
绛旓細sin(45-30)灞曞紑灏卞彲浠ユ眰鍑烘潵浜嗭紝涓轰粈涔堜竴瀹氳鐢ㄤ竴鍏冧笁娆℃柟绋嬫眰鈥︹
绛旓細涓夎鍑芥暟琛ㄥ涓嬶細涓夎鍑芥暟鐨勬湰璐ㄦ槸浠讳綍瑙掔殑闆嗗悎涓庝竴涓瘮鍊肩殑闆嗗悎鐨勫彉閲忎箣闂寸殑鏄犲皠銆傞氬父鐨勪笁瑙掑嚱鏁版槸鍦ㄥ钩闈㈢洿瑙掑潗鏍囩郴涓畾涔夌殑銆傚叾瀹氫箟鍩熶负鏁翠釜瀹炴暟鍩熴傚彟涓绉嶅畾涔夋槸鍦ㄧ洿瑙掍笁瑙掑舰涓紝浣嗗苟涓嶅畬鍏ㄣ傜幇浠ｆ暟瀛︽妸瀹冧滑鎻忚堪鎴愭棤绌锋暟鍒楃殑鏋侀檺鍜屽井鍒嗘柟绋嬬殑瑙ｏ紝灏嗗叾瀹氫箟鎵╁睍鍒板鏁扮郴銆
绛旓細sin5鏄礋鍊肩殑鍘熷洜銆傚綋瑙掑害鏄180---360搴︾殑鏃跺欙紝Y鍙栧煎氨涓鸿礋鏁帮紝鎵浠in灏卞洖鍑虹幇璐熸暟鍒椾竴涓潗鏍囩郴锛岃搴︿粠0搴﹀埌180搴︾殑鏃跺欏搴鐨勫鍦╔杞翠笂鏂癸紝Y鍘绘鍊硷紝褰撳ぇ浜180搴︽椂鍊欙紝鍒欒窇鍒拌礋鏁伴偅闈簡銆
绛旓細瑙ｏ細浣犺姹傜殑鈥滀笁瑙掑嚱鏁扮郴鏁扳濇病鏈夎繖涓蹇点傚彲鑳芥槸姹備笁瑙掑嚱鏁板 5˚涓嶆槸鐗规畩瑙掞紝鎵浠ヤ竴鑸槸鐢ㄨ绠楀櫒寰楀埌 Sin5˚=0.08716, cos5˚=0.9962, tan5˚=0.08749
绛旓細sin1=0.01745240643728351 sin2=0.03489949670250097 sin3=0.05233595624294383 sin4=0.0697564737441253 sin5=0.08715574274765816 sin6=0.10452846326765346 sin7=0.12186934340514747 sin8=0.13917310096006544 sin9=0.15643446504023087 sin10=0.17364817766693033 sin11=0.1908089953765448 sin12=0....
绛旓細瑕sincostancot鐨勪粠5搴鍒360搴︾殑鍊銆(鎸5,10,15,20,25,30.銆傘傘傝繖鏍风殑椤哄簭浠ヤ簲涓哄崟浣嶉掑)璋傜瓟鍑烘潵鐨勫姞50鍒嗙殑鎮祻鍒嗐傚埆绠℃垜骞插悧鐢ㄣ備綘... 瑕乻in cos tan cot 鐨勪粠5搴﹀埌360搴︾殑鍊笺(鎸5,10,15,20,25,30.銆傘傘傝繖鏍风殑椤哄簭浠ヤ簲涓哄崟浣嶉掑)璋傜瓟鍑烘潵鐨勫姞50鍒嗙殑鎮祻鍒嗐傚埆绠℃垜骞插悧鐢ㄣ
绛旓細1銆乻in30搴﹀凡鐭ワ紝鍒╃敤2鍊嶈鍏紡锛屾眰鍑簊in15搴 2銆佸埄鐢3鍊嶈鍏紡锛屾眰鍑sin5搴 sin锛5x锛夛紳 sin锛4x + x锛夛紳sin锛4x锛塩os锛坸锛 + cos锛4x锛塻in锛坸锛夆︹︹︼紙1锛夎 sin锛4x锛夛紳 2sin锛2x锛塩os锛2x锛夛紳 4sin锛坸锛塩os锛坸锛夛紙 2cos锛坸锛塩os锛坸锛 - 1锛夊悓鐞嗭紝灏哻os锛4x锛夊寲鎴愮敤sin...
绛旓細瑙掑害鏈変袱绉嶈〃杈 瑙掑害鍒讹紝瑙掑害鏁板瓧瑕佸姞搴 寮у害鍒讹紝瑙掑害鏁板瓧鍚庨潰寮у害鍙渷锛屾墍浠ュ厜鏄暟瀛楀氨鏄姬搴﹀埗銆傚厬鎹㈠叧绯 涓岋紙寮у害锛=180掳 4=锛4/涓岋級X180掳
绛旓細sin360=0.959;sin360=sin0=0cos360=-0.284;cos360=cos0=1tan360=-3.380;tan360=tan0=0cos72搴=[(5)-1]/4(鍒╃敤榛勯噾绛夎叞涓夎褰㈠彲寰楀嚭)sin1=0.01745240643728351 sin2=0.03489949670250097 sin3=0.05233595624294383sin4=0.0697564737441253 sin5=0.08715574274765816 sin6=0.10452846326765346sin7=0.12186934340514747 sin8...
