x⁸ + x⁷ + 1 = x⁸ + x⁷ + x⁶ - x⁶ + 1 = (x⁸ + x⁷ + x⁶) - (x⁶ - 1) =
= x⁶(x² + x + 1) - ((x³)² - 1) = x⁶(x² + x + 1) - (x³ - 1)(x³ + 1) =
= x⁶(x² + x + 1) - (x - 1)(x² + x + 1)(x³ + 1) = (x² + x + 1)(x⁶ - x⁴ + x³ - x + 1)
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интеграл (sin x-cos x)dx = интеграл sinxdx - интеграл cosxdx = -cosx - sinx + C
d=1/6-1/4=-1/12
an=a1+(n-1)*d an<-1
1/4-1/12*(n-1)<-1
-1/12(n-1)<-1 1/4
-1/12(n-1)<-5/4
n-1>15
n>16
начиная с 17 номера