f(0) и f(π) если, 1) f(x) = 1/2 * Cos(2 * X - π). f(0) = 1/2 * Cos(2 * 0 - π) = (1/2) * Cos(-π) = -1/2. f(π) = 1/2 * Cos(2 * π - π) = (1/2) * Cos(π) = 1/2. 2) f(x)^2 = tg(-2 * X). f(0)^2 = tg(-2 * 0) = 0. f(0) = 0. f(π)^2 = tg(-2 * π) = 0. f(π) = 0. 3) f(x) = 2 * cos (X/2). f(0) = 2 * cos (0/2) = 2 * 1 = 2. f(π) = 2 * cos (π/2) = 2 * 0 = 0.