大师作文网化简:{[tan(π/4+a)-tan(π/4-a)]/tan2a} *tan(π/4+a)
![化简:{[tan(π/4+a)-tan(π/4-a)]/tan2a} *tan(π/4+a)](/uploads/image/z/8711689-49-9.jpg?t=%E5%8C%96%E7%AE%80%3A%7B%5Btan%28%CF%80%2F4%2Ba%29-tan%28%CF%80%2F4-a%29%5D%2Ftan2a%7D+%2Atan%28%CF%80%2F4%2Ba%29)
化简:{[tan(π/4+a)-tan(π/4-a)]/tan2a} *tan(π/4+a)
tan（a+π4
证明tan(π/4+a)-cot(π/4+a)=2tan2a
已知tana=-3/4,求tan(a-π/4),tan2a的值
已知tan(a+4/π)=3/4求tan2a的值 要有过程在线等.
tan(a+b)=2/5,tan(a-b)=1/4,求tana,tanb,tan2a
化简[1-tan(π/4-A)]/[1+tan(π/4+A)]=
已知tan a=3,求tan（a+π/4）,tan(a-π/4)的值?
tan(a+b)=3/4,tan(a-π/4)=1/2,那么tan(b+π/4)等于多少
求证：tan（a+π/4)+tan(a-π/4）=2tan2α
已知tan(π/4+a)=-1/2,求[sin2a-2(cosa)^2]/1+tan a
化简tana+(1+tana)tan(π/4-a)