U-substitution

What is the result of this definite integral? Round your result to the nearest hundredth.

$$\int_0^\frac{\pi}{6} x \sec(3x^2) \ dx$$

Tip: Recall the fundamental theorem of calculus: $\int_a^b f(x)dx = F(b)-F(a) \iff f(x) = F'(x)$