1.如果要把sin2x变为cos2x,在图像上是移动π/2还是π/4 2把sin2x在图像上左移π/2,是sin(2x+π/2)还是sin(2(x-π/2))第二个是把sin2x在图像上左移π/2,是sin(2x+π/2)还是sin(2(x+π/2))

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1.如果要把sin2x变为cos2x,在图像上是移动π/2还是π/42把sin2x在图像上左移π/2,是sin(2x+π/2)还是sin(2(x-π/2))第二个是把sin2x在图像上左移π/2,是s

1.如果要把sin2x变为cos2x,在图像上是移动π/2还是π/4 2把sin2x在图像上左移π/2,是sin(2x+π/2)还是sin(2(x-π/2))第二个是把sin2x在图像上左移π/2,是sin(2x+π/2)还是sin(2(x+π/2))
1.如果要把sin2x变为cos2x,在图像上是移动π/2还是π/4
2
把sin2x在图像上左移π/2,是sin(2x+π/2)还是sin(2(x-π/2))
第二个是
把sin2x在图像上左移π/2,是sin(2x+π/2)还是sin(2(x+π/2))

1.如果要把sin2x变为cos2x,在图像上是移动π/2还是π/4 2把sin2x在图像上左移π/2,是sin(2x+π/2)还是sin(2(x-π/2))第二个是把sin2x在图像上左移π/2,是sin(2x+π/2)还是sin(2(x+π/2))
sin2x=cos(π/2-2x)=cos[2(x-π/4)]
所以
在图像上是移动π/4
是在x上
2.
sin(2x)
sin2x在图像上左移π/2
sin[2(x+π/2)]=sin(2x+π)=-sin2x