13/12/29 13:08:21.09
>>132
coth(2t) = (1/2){coth(t) + 1/coth(t)},
>>139
cot(2θ) = (1/2){cotθ - 1/(cotθ)},
13/12/29 13:08:21.09
>>132
coth(2t) = (1/2){coth(t) + 1/coth(t)},
>>139
cot(2θ) = (1/2){cotθ - 1/(cotθ)},
13/12/29 13:08:21.09
>>132
coth(2t) = (1/2){coth(t) + 1/coth(t)},
>>139
cot(2θ) = (1/2){cotθ - 1/(cotθ)},