Question

Cat e integrala din 1 supra [cos^2 × (2x+3)] ?

Answer 1

$\int\limits { \frac{1}{ cos^{2}(2x+3) } } \, dx= \int\limits { \frac{d(2x+3)}{ cos^{2}(2x+3) } } \, dx= \frac{1}{2}tg(2x+3)+C$