第四题，求过程。。。。
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4.
g(x)=sin(x-2π/3)
=cos[π/2-(x-2π/3)]
=cos(7π/6 -x)
=cos(x- 7π/6)
=cos(x-7π/6+2π)
=cos(x+5π/6)
=cos[(x+π/3)+ π/2]
g(x)图像由f(x)图像向左平移π/2个单位得到。
选B
g(x)=sin(x-2π/3)
=cos[π/2-(x-2π/3)]
=cos(7π/6 -x)
=cos(x- 7π/6)
=cos(x-7π/6+2π)
=cos(x+5π/6)
=cos[(x+π/3)+ π/2]
g(x)图像由f(x)图像向左平移π/2个单位得到。
选B
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