【正文】
2c o sc o ss i ns i n___,s i nc o sc o s3s i n0c o s3s i n)22222???????????????????????????????一:求值 ??????????2c o s,2s i n53)s i n (,1312)c o s (,432 )3,求若????????)2t a n (),t a n ( 21)t a n (),2(,53s i n)4????????????????求,???? 2c os2s i n,3)4t a n()5 ??? 求???????????????求)2,0(,2572c o s),23,(,53s i n)6)322s i n()2,1()7 ??? ?? ,求終邊上一點(diǎn)角 P)c o s (),t a n (),c o s (,31c o sc o s,41s i ns i n)8?????????????????求若xxxxx4s i n,2c o s),2(,61)4s i n ()4s i n ()9求????????????????????t a n4 0t a n2 03t a n4 0