作业帮求证：tan(x/2+派/4)+tan(x/2-派/4)=2tanx
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求证：tan(x/2+派/4)+tan(x/2-派/4)=2tanx
求证：tan(x/2+派/4)+tan(x/2-派/4)=2tanx
求证：tan(x/2+派/4)+tan(x/2-派/4)=2tanx
tan(x/2+π/4)+tan(x/2-π/4)
＝[tan(x/2)+tan(π/4)]/[1-tan(x/2)tan(π/4)]+[tan(x/2)-tan(π/4)]/[1+tan(x/2)tan(π/4)]
=[tan(x/2)+1]/[1-tan(x/2)]+[tan(x/2)-1]/[tan(x/2)+1]
={[tan(x/2)+1]^2-[1-tan(x/2)]^2}/[1-tan(x/2)][tan(x/2)+1]
=4tan(x/2)/[1-tan^2(x/2)]
=2tanx
求证：tan(x/2+派/4)+tan(x/2-派/4)=2tanx
求证：tan(x/2+派/4)+tan(x/2-派/4)=2tanx{[tan(x/2)+1]^2-[1-tan(x/2)]^2}=4tan(x/2)具体怎么得到
y=tan(2x-派/4)
求证恒等式：(1+sinx)/cosx=tan(派/4+x/2);
化简:cos(x-派)tan(x-2派)tan(2派-x)/sin(派+X)
tan(-5派/4)=?tan(-2派/3)=?
tan x + 派=2 x=?
已知sin(2x+y)=5siny,(y不等于K派),求证;3tan=2tan(x+y)
化简:sin(2派-x)tan(派+x)cot(-x-派)/tan(3派-x)cos(派-x)
函数 tan（2x-4分之派）的定义域
y=tan（2x+派/4）的定义域
lim x趋近于派/2 tan-5/sec+4
tanx=2,则tan(派/4+x)=?
tanx=2,则tan(派/4+x)=?
已知tan（x＋5派／4 ）＝2 求tan xr t
tan(2分之x+4分之派)乘tan(2分之x-4分 之派)=?
tan(派/2+a)
求证tan(x+y)*tan(x-y)=tan^2x-tan^2y/1-tan^2xtan^2y