函数f()x=sinxcos(x-派/4)+sin(派/2+x)sin(x-派/4)的图像是
问题描述:
函数f()x=sinxcos(x-派/4)+sin(派/2+x)sin(x-派/4)的图像是
答
f()x=sinxcos(x-派/4)+cosxsin(x-派/4)
=sin(x+x-派/4)
=sin(2x-派/4)
=sin[2(x-派/8)]
所以就是把sinx向右移派/8,然后把横坐标缩小为原来的1/2