tan2a,tan(a+b),tan(a-b)分别等于什么?
tan(a+b)=3 tan(a-b)=5 求tan2a tan2b的值
tan(a+b)=2/5,tan(a-b)=1/4,求tana,tanb,tan2a
tan(a+b)=3,tan(a-b)=5,求tan2a和tan2b的值
已知tan(a+b)=3,tan(a-b)=5,求tan2a,tan2b的值~
tan(a+b)=5,tan(a-b)=3求tan2a,tan2b的值?
tan(A+B)=3,tan(A-B)=5,求tan2A,tan2B.(A,B是角)
已知tan(a+b)=3,tan(a-b)=5,求tan2a,tan2b的值.辛苦
已知tan(a-b)=1/3,tan(a+b)=1/2,求tan2a,tan2b的值
2(tan a+tan b)
已知tan(a+b)=3,tan(a-b)=5 试求:tan2a和tan2 b的值
已知tan(a+b)=3,tan(a-b)=5,则tan 2a等于多少?
化简:{[tan(π/4+a)-tan(π/4-a)]/tan2a} *tan(π/4+a)