I.3.3.27 Definite Integrals

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