Probability

$$\text { If } f(x)= \begin{cases}3\left(1-2 x^2\right) & ; 0< x < 1 \\ 0 & ; \text { otherwise }\end{cases}$$ is a probability density function of \(\mathrm{X}\), then \(\mathrm{P}\left(\frac{1}{4} < x < \frac{1}{3}\right)\) is