回答1：
灞曞紑鍏ㄩ儴tan涓夎鍑芥暟鍏紡澶у叏鍙婅繍绠?/strong>
涓€銆乼an涓夎鍑芥暟鐨勫熀鏈叕寮?/strong>
瀹氫箟鍏紡锛歵an伪 = sin伪 / cos伪锛坈os伪 鈮?0锛?ul>鍦ㄧ洿瑙掍笁瑙掑舰涓紝tan伪绛変簬瀵硅竟闀垮害涓庨偦杈归暱搴︾殑姣斿€笺€?/li>浜屻€乼an涓夎鍑芥暟鐨勫拰瑙掑叕寮?/strong>
tan(A+B) = (tanA + tanB) / (1 - tanA * tanB)鐢ㄤ簬璁＄畻涓や釜瑙掔殑鍜岀殑姝ｅ垏鍊笺€?/li>涓夈€乼an涓夎鍑芥暟鐨勫€嶈鍏紡
手机：18632699551（微信同号）tan2伪 = (2tan伪) / (1 - tan²伪)鐢ㄤ簬璁＄畻涓€涓鐨勪袱鍊嶈鐨勬鍒囧€笺€?/li>鍥涖€乼an涓夎鍑芥暟鐨勫崐瑙掑叕寮?/strong>铁皮保温
tan(伪/2) = sin伪 / (1 + cos伪) = (1 - cos伪) / sin伪鐢ㄤ簬璁＄畻涓€涓鐨勪竴鍗婅鐨勬鍒囧€笺€?/li>浜斻€乼an涓夎鍑芥暟鐨勯檷骞傚叕寮?/strong>
tan²伪 = (1 - cos2伪) / (1 + cos2伪)鐢ㄤ簬灏嗘鍒囧€肩殑骞虫柟杞寲涓轰綑寮﹀€肩殑鍑芥暟銆?/li>鍏€乼an涓夎鍑芥暟鐨勪竾鑳藉叕寮?/strong>
原标题：烟台幸福新城配套中学项目满眼“美景安全范儿”
tan伪 = (2tan(伪/2)) / (1 - tan²(伪/2))锛堟鍏紡褰㈠紡杈冨锛屾涓哄叾涓竴绉嶏級涓囪兘鍏紡鍙互閫氳繃鍗婅鍏紡鎺ㄥ鍑烘潵锛岀敤浜庡皢浠绘剰瑙掔殑涓夎鍑芥暟鍊艰浆鍖栦负鍗婅涓夎鍑芥暟鍊肩殑鍑芥暟銆?/li>涓冦€佺壒娈婅鐨則an鍊?/strong>
tan30掳 = 鈭?/3tan45掳 = 1tan60掳 = 鈭?杩欎簺鐗规畩瑙掔殑tan鍊煎湪涓夎鍑芥暟杩愮畻涓粡甯哥敤鍒帮紝闇€瑕佺啛璁般€?/li>鍏€乼an涓夎鍑芥暟鐨勮繍绠?/strong>
鍦ㄨ繘琛宼an涓夎鍑芥暟鐨勮繍绠楁椂锛岄渶瑕佹敞鎰忚搴︾殑鍗曚綅锛堥€氬父涓哄害鎴栧姬搴︼級锛屼互鍙婅繍绠楃殑浼樺厛绾э紙鍏堜箻闄ゅ悗鍔犲噺锛屾湁鎷彿鍏堢畻鎷彿閲岀殑锛夈€?/li>鍚屾椂锛岃繕闇€瑕佹敞鎰忎笁瑙掑嚱鏁扮殑瀹氫箟鍩熷拰鍊煎煙锛屼緥濡倀an伪鍦ㄎ?鈮?k蟺 + 蟺/2锛坘涓烘暣鏁帮級鏃舵湁瀹氫箟锛屼笖鍊煎煙涓篟銆?/li>浠ヤ笂鏄痶an涓夎鍑芥暟鍏紡澶у叏鍙婅繍绠楃殑绠€瑕佷粙缁嶏紝甯屾湜瀵硅В鍐崇浉鍏抽棶棰樻湁鎵€甯姪銆?/p>