五点法(函数一个周期)2x-π/4=0 x=π/8 f（x）=02x-π/4=π/2 x=3π/8 f（x）=根号22x-π/4=π x=5π/8 f（x）=02x-π/4=3π/2 x=7π/8 f（x）=-根号22x-π/4=2π x=9π/8 f（x）=0函数f（x）的所有对称中心的坐标(...