ÌâÄ¿ÄÚÈÝ


ijͬѧÔÚÒ»´ÎÑо¿ÐÔѧϰÖз¢ÏÖ£¬ÒÔÏÂÎå¸öʽ×ÓµÄÖµ¶¼µÈÓÚͬһ¸ö³£Êý£º

(1)sin213¡ã£«cos217¡ã£­sin13¡ãcos17¡ã£»

(2)sin215¡ã£«cos215¡ã£­sin15¡ãcos15¡ã£»

(3)sin218¡ã£«cos212¡ã£­sin18¡ãcos12¡ã£»

(4)sin2(£­18¡ã)£«cos248¡ã£­sin(£­18¡ã)cos48¡ã£»

(5)sin2(£­25¡ã)£«cos255¡ã£­sin(£­25¡ã)cos55¡ã.

(1)Çë¸ù¾Ý(2)ʽÇó³öÕâ¸ö³£Êý£»

(2)¸ù¾Ý(1)µÄ¼ÆËã½á¹û£¬½«¸ÃͬѧµÄ·¢ÏÖÍÆ¹ãΪÈý½ÇºãµÈʽ£¬²¢Ö¤Ã÷ÄãµÄ½áÂÛ£®

£¨Ö¤Ã÷²½Ö辡¿ÉÄÜÏêϸ£¡£©


½â£º½â·¨Ò»£º

(1)¼ÆËãÈçÏ£º

sin215¡ã£«cos215¡ã£­sin15¡ãcos15¡ã£½1£­sin30¡ã£½1£­£½¡­¡­¡­¡­..3·Ö

(2)Èý½ÇºãµÈʽΪsin2¦Á£«cos2(30¡ã£­¦Á)£­sin¦Ácos(30¡ã£­¦Á)£½¡­¡­¡­.7·Ö

Ö¤Ã÷ÈçÏ£º

sin2¦Á£«cos2(30¡ã£­¦Á)£­sin¦Ácos(30¡ã£­¦Á)

£½sin2¦Á£«(cos30¡ãcos¦Á£«sin30¡ãsin¦Á)2£­sin¦Á(cos30¡ãcos¦Á£«sin30¡ãsin¦Á)¡­¡­.10·Ö

£½sin2¦Á£«cos2¦Á£«sin¦Ácos¦Á£«sin2¦Á£­sin¦Ácos¦Á£­sin2¦Á

£½sin2¦Á£«cos2¦Á£½¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­.13·Ö

½â·¨¶þ£º

(1)ͬ½â·¨Ò»£®

(2)Èý½ÇºãµÈʽΪsin2¦Á£«cos2(30¡ã£­¦Á)£­sin¦Ácos(30¡ã£­¦Á)£½¡­¡­.7·Ö

Ö¤Ã÷ÈçÏ£º

sin2¦Á£«cos2(30¡ã£­¦Á)£­sin¦Ácos(30¡ã£­¦Á)

£½£«£­sin¦Á(cos30¡ãcos¦Á£«sin30¡ãsin¦Á)¡­¡­¡­10·Ö

£½£­cos2¦Á£«£«(cos60¡ãcos2¦Á£«sin60¡ãsin2¦Á)£­sin¦Ácos¦Á£­sin2¦Á

£½£­cos2¦Á£«£«cos2¦Á£«sin2¦Á£­sin2¦Á£­(1£­cos2¦Á)

£½1£­cos2¦Á£­£«cos2¦Á£½¡­¡­¡­¡­¡­¡­¡­13·Ö


Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿

Î¥·¨ºÍ²»Á¼ÐÅÏ¢¾Ù±¨µç»°£º027-86699610 ¾Ù±¨ÓÊÏ䣺58377363@163.com

¾«Ó¢¼Ò½ÌÍø