I just need part a answered correctly

Find the indefinite integrals (a) integral dx/x(x- 3), (b) integral x^3/(x^2 + 25)^1/2 dx, (c) integral^infinity_1 dx/x ln (x), (d) integral sin (2x)/1 + cos(x)^4 dx. Solve the following differential equations. (a) dy/dt = x^4y/ln(y), (b) dy/dx + 2xy - y = 0, y(0) = 3