你好!y = √(1+a²) sin(2x+φ)其中tanφ = a 关于 x = - π/8 对称 （应该是你打错题目了）sin[ 2*(-π/8) + φ ] = ± 1φ - π/4= π/2 + kπφ = 3π/4 + kπa = tanφ = tan (3π/4) = - 1...