Level:
Project ID:
1003108201
Accepted:
1
Evaluate the definite integral \( \int\limits_0^{\frac{\pi}6}\frac{3\cos2t}{\cos t+\sin t}\,\mathrm{d}t \). Which of the following intervals contains the value of the integral?
\( (0.8;1.2) \)
\( (0.4;0.8) \)
\( (-0.8;-0.1) \)
\( (-0.1;0.4) \)