Question

Умоляю помогите!!!
Задачи на синусы/косинусы/тангенсы/котангенсы

Answer 1

$t=-\dfrac{\pi}{4}:\ \ \ \ tg\Big(-\dfrac{\pi}{4}\Big)=-1\\\\\\t=\dfrac{2\pi}{3}:\ \ \ \ tg\dfrac{2\pi}{3}=-\sqrt3\\\\\\t=\dfrac{\pi}{6}:\ \ \ \ tg\dfrac{\pi}{6}=\dfrac{\sqrt3}{3}\\\\\\t=-\dfrac{5\pi}{2}:\ \ \ \ tg\Big(-\dfrac{5\pi}{2}\Big)\ \ \ ne\ syshestvyet$