一道正弦的变换

问题描述:

一道正弦的变换
sin(2x+π/4) 左移π/4个单位 得到什么?

【参考答案】
y=sin(2x+π/4)
=sin2(x+π/8)
左移π/4后→
y'=sin2(x+π/8+π/4)
=sin2(x+3π/8)
=sin(2x+ 3π/4)
=-sin(2x- π/4)