i.3.3.27 Definite Integrals

condition: Calculate definite integrals: 1) \( \int_{0}^{\pi / 12} \frac{d x}{\cos ^{4} 3 x} \), 2) \( \int_{0}^{\frac{1}{2}} \frac{d x}{\left(1-x^{2}\right) \sqrt{1-x^{2}}} \)