1
Sx^25dx=1/26*x^26+C
2
Sx^(3/20)dx=20/23*x^(23/20)+C
3
Sdx/(5-8x)=-1/8*ln|5-8x|+C
4
S4^xdx=4^x/ln4+C
5
Sdx/(x²-225)=1/30(Sdx/(x-15)-Sdx/(x+15))=1/30(ln|x-15|_ln|x+15|)=
=1/30*ln[(x-15)/(x+15)]+C
1/(x²-225)=A/(x-15)+B/(x+15)=(Ax+15A+Bx-15B)/(x²-225
x*(A+B)=0*x⇒A+B=0⇒A=-B
15(A-B)=1⇒A-B=1/15
-2B=1/15
B=-1/30
A=1/30