Question

[Pham Trong Bach]

Cho hàm số $g\left(t\right) = {\cos }^{2}2t.$

Tính  $g\text{'}\text{'}\text{'}\left(-\frac{\mathrm{\pi }}{2}\right); g\text{'}\text{'}\text{'}\left(-\frac{\mathrm{\pi }}{24}\right); g\text{'}\text{'}\text{'}\left(\frac{2\mathrm{\pi }}{3}\right)$

Answer 1

[Cao Minh Tâm]