4-4 同角三角函数的基本关系式.pdf

4.4 鍚岃涓 瑙掑嚱鏁哥殑 鍩烘湰闂滀總 寮 瀛哥繏鐩 飩?. 鎺屾彙鍚岃涓夎鍑芥暩鐨勫熀鏈棞淇傚紡锕 飩?. 閬嬬敤鍏紡锛岃В姹轰笁瑙掑嚱鏁告眰鍊笺€佸寲绨€佹亞绛夊紡璀 鏄庣殑椤岀洰銆 飩￠噸榛烇箷鍚岃涓夎鍑芥暩鐨勫熀鏈棞淇傚紡鐨勬帹灏庡強瑙ｆ焙涓€ 椤炰笁瑙掓眰鍊兼柟闈㈢殑鎳夌敤銆 飩￠洠榛烇箷鍩烘湰闂滀總寮忕殑閬稿彇鍙婅В椤屻€ 瑜囩繏 飩№睜饊仏肀 饊嫾 = 饊亹肀滍睜 饊嫾 = 肀№睅肀 饊嫾 = 飩○€亹肀滍薄 饊嫾 = 肀狆€亽饊亹 饊嫾 = 饊亹肀狆€亹 饊嫾 = 涓夎鍑芥暩 瀹氱京鍩 肀狆€仏肀 饊嫾 , 饊亹肀滍睜 饊嫾 肀№睅肀 饊嫾 , 肀狆€亽饊亹 饊嫾 饊亹肀滍薄 饊嫾 , 饊亹肀狆€亹 饊嫾 瑜囩繏 飩″叚鍊嬩笁瑙掑嚱鏁哥殑鍊煎湪鍚勮薄闄愮殑绗﹁櫉 肀 肀 肀 饊亗 肀 饊亗 肀 饊亗 肀 肀狆€仏肀 饊嫾 , 饊亹肀滍睜 饊嫾 肀№睅肀 饊嫾 , 肀狆€亽饊亹 饊嫾 饊亹肀滍薄 饊嫾 , 饊亹肀狆€亹 饊嫾 鍚岃涓夎鍑芥暩鐨勫熀鏈棞淇 飩?. 骞虫柟闂滀總锕 飩?. 鍟嗙殑闂滀總锕曫€嫾 鈮 饊仒饊寢 (饊仒 鈭 肀? 2 飩?. 鍊掓暩闂滀總锕曫€嫾 鈮 饊仒饊寢 (饊仒 鈭 肀? 2 渚嬮 飩?. 宸茬煡肀狆€仏肀 饊嫾 = 4 锛屼甫涓旔€嫾鏄浜岃薄闄愯锛屾眰 5 饊亹肀滍睜 饊嫾, 肀№睅肀 饊嫾 , 饊亹肀滍薄 饊嫾 鐨勫€笺€ 飩¤В锕曗埖 肀狆€仏肀? 饊嫾 + 饊亹肀滍睜2 饊嫾 = 1 渚嬮 飩?. 宸茬煡饊亹肀滍睜 饊嫾 = 鈭 8 锛屼笖饊亹肀滍睜 饊嫾 鈮 鈭? 锛岉睜饊仏肀 饊嫾 , 肀№睅肀 饊嫾 姹傜殑 17 鍊笺€ 飩¤В锕曗埖 饊亹肀滍睜 饊嫾 0 涓 饊亹肀滍睜 饊嫾 鈮 鈭? 鈭 饊嫾鏄浜屾垨绗笁璞￠檺瑙 飩?) 濡傛灉饊嫾鏄浜岃薄闄愯鏅傦紝肀狆€仏肀 饊嫾 0, 肀№睅肀 饊嫾 0 渚嬮 飩?. 宸茬煡肀№睅肀 饊嫾 = 鈭 3 锛屾眰肀狆€仏肀 饊嫾 , 饊亹肀滍睜 饊嫾 鐨勫€笺€ 4 飩¤В锕曗埖 肀№睅肀 饊嫾 0 鈭 饊嫾鏄浜屾垨绗洓璞￠檺瑙 飩?) 濡傛灉饊嫾鏄浜岃薄闄愯鏅傦紝肀狆€仏肀 饊嫾 0, 饊亹肀滍睜 饊嫾 0 绶寸繏 飩?. 宸茬煡饊亹肀滍睜 饊嫾 = 鈭 4 锛屼甫涓旔€嫾鏄涓夎薄闄愯锛屾眰 5 肀狆€仏肀 饊嫾, 肀№睅肀 饊嫾 , 饊亹肀滍薄 饊嫾鐨勫€笺€ 绶寸繏