а) sin 13π/6
13π/6 = 2π + π/6
sin (2π + π/6) = sin (π/6) = 1/2
Ответ: sin 13π/6 = 1/2
б) tg (-11π/6)
-11π/6 = -π - π/6
tg (-π - π/6) = tg (-π/6) = -√3
Ответ: tg (-11π/6) = -√3
в) cos п + ctg 4π/6
cos п = -1
4π/6 = 2π/3
ctg (2π/3) = ctg (120°) = -√3
cos п + ctg (2π/3) = -1 + (-√3) = -1 - √3
Ответ: cos п + ctg 4π/6 = -1 - √3
а) sin 13π/6
13π/6 = 2π + π/6
sin (2π + π/6) = sin (π/6) = 1/2
Ответ: sin 13π/6 = 1/2
б) tg (-11π/6)
-11π/6 = -π - π/6
tg (-π - π/6) = tg (-π/6) = -√3
Ответ: tg (-11π/6) = -√3
в) cos п + ctg 4π/6
cos п = -1
4π/6 = 2π/3
ctg (2π/3) = ctg (120°) = -√3
cos п + ctg (2π/3) = -1 + (-√3) = -1 - √3
Ответ: cos п + ctg 4π/6 = -1 - √3