why don't you post your answers here and than we can confirm if they are correct.
Can somebody solve these so that i can check my answers?
1. (4x^3 + 3x^2 + 2x + 1)^5
2. (x + 4)/( x^2+ x^3)
3. x^4 Cos x
For the above, go to differentiate (4x^3 + 3x^2 + 2x + 1)^5 - Wolfram|Alpha
Click on Show steps.