How do you simplify sin 4 theta using the double angle theory?

Double angle formulae involve trigonometric functions of double angles and in order to get its value you must consider the following:

-derive the double angle formula from additional formula

-write the formula for the angle in alternative form

-use the formula to write trigonometric expressions in different forms

-use the formula in the solution of trigonometric equations

And the answer would be 4sin (theta) cos (theta) cos (2theta)