help mee..
derivative of a function

f(x)= (x^2 + 1) ^2 / 5

you need to focus on the exponent first. Move it down in front of the brackets and then subtract 1 from the current exponent. Then multiply that by the derivative of what's inside the brackets.

d/dx (x^2 + 1)^ (2/5)

= [2/5(x^2 + 1)^(-3/5)] * d/dx(x^2 + 1)
= [2/5(x^2 + 1)^(-3/5)] * 2x