24/04/17 20:52:03.69 qbH/8Fwh.net
>>263
(a-1)(b-1) = 1234567891 = p,
{a,b} = {0,1-p}, {2,1+p},
(a-b)^2 = (p-1)^2,
>>264
なし
>>267
x=e^t とおくと
(与式) = ∫[0,1] (t^3)(e^t)dt dt
= [ (t^3 －3tt + 6t －6)e^t ](0→1)
= 6－2e,
>>268
6乗数 1, 64, 729, 4096, 15625, 46656, 117649, 262144, 531441, …
>>272-273
和積公式で
y = sin(x) + sin(x+60°)
= 2 cos(30°) sin(x+30°)
= (√3) sin(x+30°)