tan (a +b )等于3,tan (a _b )等于5,求tan2a

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 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) tan(a+b)=2/5,tan(a-b)=1/4,求tana,tanb,tan2a 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 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? 已知tan(a+β)=3,tan(a-β)=5,求tan2a,tan2β的值 tan(a+b)=3/4,tan(a-π/4)=1/2,那么tan(b+π/4)等于多少