The values of sin cycle on the domain 0 to 2π The value of sin(π/2) = 1 The value of sin(2π/2) = 0 The value of sin(3π/2) = sin(π + π/2)= -1 Therefore, if the angle can be written as: nπ + π/2, where n is any odd number, the value of sin(nπ + π/2) = -1 sin(11π/2) = sin(5π + π/2) = -1
