Simplify

Let's define :
R2(x) = x^(1/2) (Square root)
R3(x) = x^(1/3) (Cubic root)

We can simplify the following expression:
R3(R3(2)-1) as
R3(1/9)-R3(2/9) + R3(4/9)

Latex code
$$\sqrt[3]{\sqrt[3]{2}-1}=\sqrt[3]{1/9}-\sqrt[3]{2/9}\sqrt[3]{4/9}$$

Can you simplify R2(R3(3645)-R3(2916))?
Latex code
$$\sqrt{\sqrt[3]{3645}-\sqrt[3]{2916}}$$

Format answer: a linear combination of radicands in increasing order using functions R2, R3 and without spaces.

Hint: The anwser involves only small integers ...