A) = int(ctgxdx) + int(2/3 x^6)dx= -int((dcosx)/cosx) +(2x^7)/21 +C=
-lncosx + (2x^7)/21 +C
б) = (1/6)int((e^(x^6))dx^6=(1/6)e^(x^6)
в) = (1/10)int(lnx dx^10) = (1/10)(x^10)lnx - (1/10)int(x^10 dlnx)=
(1/10)(x^10)lnx - (1/10)int(x^9 dx)=
(1/10)(x^10)lnx - (1/10)x^10)/10 + C= (1/10)(x^10)lnx - (1/100)x^10) + C