sinA=五分之三,则∠A为多少度? cosA=3/5,则∠A=多少度?
sinA=\u4e09\u5206\u4e4b\u6839\u53f7\u4e09 \u5219\u89d2A\u7b49\u4e8e\u591a\u5c11\u5ea6sinA=\u221a3/3
\u5219A=arcsin\u221a3/3.
\u5177\u4f53\u6570\u636e\u901a\u8fc7\u67e5\u8868\u53ef\u5f97\u7b54\u6848.
cosA=3/5
\u2220A=arccos\uff083/5\uff09=arccos\uff080.6\uff09\u224853.13\u00b0
\u7b54\u9898\u4e0d\u6613\uff0c\u671b\u91c7\u7eb3~~~
A=37度
绛旓細宸茬煡闃垮皵娉曚负閿愯,SinA=浜斿垎涔嬩笁,姹侰osA,tanA鐨勫 鎴戞潵绛 1涓洖绛 #鐑# 濡備綍缂撹В鐒﹁檻鎯呯华?鐧惧害缃戝弸acab765 2013-08-07 路 TA鑾峰緱瓒呰繃170涓禐 鐭ラ亾绛斾富 鍥炵瓟閲:104 閲囩撼鐜:0% 甯姪鐨勪汉:42.2涓 鎴戜篃鍘荤瓟棰樿闂釜浜洪〉 鍏虫敞 灞曞紑鍏ㄩ儴 鏇村杩介棶杩界瓟 杩介棶 鍗佸垎鎰熻阿 杩界瓟 鏈洖绛旂敱...
绛旓細-4/5
绛旓細鈭sina锛3锛5锛cosa锛4锛5 鈭磗in锛坅锛嬒锛4锛夛紳sinacos蟺锛4锛媍osasin蟺锛4 锛3锛5 脳鏍2锛2锛4锛5脳鏍2锛2 锛7鏍2锛10
绛旓細濡傚浘
绛旓細鍥炵瓟锛sina=3/5 a灞炰簬90,180 cosa=-4/5 sin(a-60)=sinacos60-cosasin60
绛旓細sina鐨勫钩鏂瑰姞cosa鐨勫钩鏂圭瓑浜1锛屽洜涓篴鏄攼瑙掞紝鎵浠osa澶т簬0锛屾墍浠osa=浜斿垎涔鍥
绛旓細宸茬煡a鏄浜岃薄闄愮殑瑙,鍒檆osa,tana閮戒负璐熸暟,sina鐨勫钩鏂逛笌cosa鐨勫钩鏂圭殑鍜屼负1,鍒欏彲姹傚嚭cosa涓鸿礋5鍒嗕箣鍥,tana涓鸿礋4鍒嗕箣3.,2,COSa涓鸿礋浜斿垎涔鍥 tana涓鸿礋鍥鍒嗕箣涓,2,COSA 4/5 TANA 璐3/4,2,
绛旓細濡傚浘
绛旓細绛変簬4/5銆傚洜涓烘寮=瀵硅竟/鏂滆竟锛屼綑寮=涓磋竟/鏂滆竟銆傜幇sina=3/5锛鑰屼笖涓磋竟銆佸杈广佹枩杈规瀯鎴愮洿瑙掍笁瑙掑舰锛屾牴鎹枩杈圭殑骞虫柟=涓や釜鐩磋杈癸紙涓磋竟鍙婂杈癸級鐨勫钩鏂瑰拰锛屽彲鐭os a=4/5.
绛旓細鍥炵瓟锛歝osa=璐浜斿垎涔鍥,tana=璐熷洓鍒嗕箣涓