1.已知tan(a+b)=3,tan(a-b)=5,则tan2a等于多少?
已知tan(a+b)=3,tan(a-b)=5,求tan2a,tan2b的值~
已知tan(a+b)=3,tan(a-b)=5,则tan 2a等于多少?
tan(a+b)=3 tan(a-b)=5 求tan2a tan2b的值
tan(a+b)=3,tan(a-b)=5,求tan2a和tan2b的值
tan(a+b)=5,tan(a-b)=3求tan2a,tan2b的值?
已知tan(a+b)=3,tan(a-b)=5,求tan2a,tan2b的值.辛苦
tan(A+B)=3,tan(A-B)=5,求tan2A,tan2B.(A,B是角)
已知tan(a-b)=1/3,tan(a+b)=1/2,求tan2a,tan2b的值
tan(a+b)=2/5,tan(a-b)=1/4,求tana,tanb,tan2a
已知tan(a+b)=3,tan(a-b)=5 试求:tan2a和tan2 b的值
1.已知tan(a+b)=3,tan(a-b)=2,则sin4a=?
1.已知tan(A+B)=3 tan(A-B)=5