化简 (cot a/2 -tan a/2)(1+ tan a * tan a/2)
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化简 (cot a/2 -tan a/2)(1+ tan a * tan a/2)
![化简 (cot a/2 -tan a/2)(1+ tan a * tan a/2)](/uploads/image/z/6511982-14-2.jpg?t=%E5%8C%96%E7%AE%80+%28cot+a%2F2+-tan+a%2F2%29%281%2B+tan+a+%2A+tan+a%2F2%29)
[1-tan^2(a/2)]/tan(a/2) *[1+2tan^2(a/2)]/[1-tan^2(a/2)]
=[1-tan^2(a/2)+2tan^2(a/2)]/tan(a/2)
=[1+tan^2(a/2)]/tan(a/2)
=1/sin(a/2)cos(a/2)=2/sina
=[1-tan^2(a/2)+2tan^2(a/2)]/tan(a/2)
=[1+tan^2(a/2)]/tan(a/2)
=1/sin(a/2)cos(a/2)=2/sina
化简 (cot a/2 -tan a/2)(1+ tan a * tan a/2)
证明:(1+tan a+cot a)/(1+tan^2 a+tan a)-cot a/(1+ tan^2 a)=sin
tan(a/2)+cot(a/2)=?
化简cot^2 A(tan^2 A-sin^2 A)
化简:cot^2A(tan^2A-sin^2A)
2(tan a+tan b)
(cot (a/2) -tan (a/2))^2(1-tan a / tan (2a))
怎么证明tan^2A+cot^2A不等于1
证明(tan^2a+tana+1)(cot^2a+cota+1)=tan^2a+cot^2a+1
化简:cot^a(tan^a-sin^a)
化简sin(3π+a)tan(a-π)cot(π+a)/tan(2π-a)cos(π-a)
化简sin(2π-a)tan(π+a)cot(-a-π)\cos(π-a)tan(3π-a)