QUESTION $3,1$ POINT

Evaluate the integrat below.

${\displaystyle \underset{\phantom{}}{\overset{\phantom{}}{}}}si{n}^2(3x)co{s}^2(3x)dx$

Remember to put the arguments of the trigonometric functions in parentheses.

Broulde your answer below:

${\displaystyle \underset{\phantom{}}{\overset{\phantom{}}{}}}si{n}^2(3x)co{s}^2(3x)dx=$

$$