把横坐标扩大为2倍,则x的系数乘1/2sin(x/2+π/4)假设是向左移π/3则x换成x+π/3sin[(x+π/3)/2+π/4]=sin(x/2+5π/12)如果是向右移则x换成x-π/3先左移π/3则x换成x+π/3=sin[(x+π/3)+π/4]=sin(x+7π/12)在横坐标...