Question

derivatve of f(theta)= sq root 2theta

Answer 1

lets use x instead of theta, okay?

Answer 2

\(\large\color{blue}{ f(x)=\sqrt{2x} }\)

Answer 3

First derive the function, as if it was just a square root of x, then multiply times the derivative of the insides (saying, --- times the derivative of 2x).