2sin75cos15-1= tan165/1-tan^2 345= 若2tanx+1=0,x属于(0,π)则x= 函数y=tan(π/4-x)的定义域(1)2sin75cos15-1= (2)tan165/1-tan^2 345= (3)若2tanx+1=0,x属于(0,π)则x= (4)函数y=tan(π/4-x)的定义域

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2sin75cos15-1= tan165/1-tan^2 345= 若2tanx+1=0,x属于(0,π)则x= 函数y=tan(π/4-x)的定义域(1)2sin75cos15-1= (2)tan165/1-tan^2 345= (3)若2tanx+1=0,x属于(0,π)则x= (4)函数y=tan(π/4-x)的定义域
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2sin75cos15-1= tan165/1-tan^2 345= 若2tanx+1=0,x属于(0,π)则x= 函数y=tan(π/4-x)的定义域(1)2sin75cos15-1= (2)tan165/1-tan^2 345= (3)若2tanx+1=0,x属于(0,π)则x= (4)函数y=tan(π/4-x)的定义域
2sin75cos15-1= tan165/1-tan^2 345= 若2tanx+1=0,x属于(0,π)则x= 函数y=tan(π/4-x)的定义域
(1)2sin75cos15-1=
(2)tan165/1-tan^2 345=
(3)若2tanx+1=0,x属于(0,π)则x=
(4)函数y=tan(π/4-x)的定义域

2sin75cos15-1= tan165/1-tan^2 345= 若2tanx+1=0,x属于(0,π)则x= 函数y=tan(π/4-x)的定义域(1)2sin75cos15-1= (2)tan165/1-tan^2 345= (3)若2tanx+1=0,x属于(0,π)则x= (4)函数y=tan(π/4-x)的定义域
(1)2sin75°cos15°-1= 2cos²15°-1=cos30°=(根号3)/2
(2)tan165°/(1-tan^2 345°)
= -tan15°/(1- tan²15°)
=(-1/2)*2tan15°/(1- tan²15°)
=(-1/2)*tan30°
=(-1/2)*(根号3)/3
= - (根号3)/6
.
(3)若2tanx+1=0,x属于(0,π)则:tanx=-1/2
解得:x= π - arctan(1/2)
.
(4)函数y=tan(π/4-x)的定义域:(-π/4 +kπ,3π/4 +kπ),k∈Z