Question

Найдите значение функции y=1/cosx, если а)x=2П/3 б)11П/6 26.11.2012

Answer 1

Y = 1/cos x
a) x = 2π/3
cos 2π/3 = -0.5
y = 1 / (-0.5)  = -2
б) x = 11π/6
cos 11π/6 = 0.5√3
y = 1 / (0.5√3)  = 2/√3 = (2√3)/3