tan(a+b)等于什么,tan2x等于什么

2013-07-03 13:33 真de无上|十五级 tan(a b) = (tana tanb)/(1-tana
英语作业本中的一题tan plus ten is ten,ten minus ten is twenty.
tan (a b )等于3,tan (a _b )等于5,求tan2a
x>y c.x y d.x≥y3.若(4tan a 1)(1-4tanb)=17,则tan(a-b)= a.1/4 b.
若tana=7/4及tan(a-b)=1/2,求tanb的值