不画图,写出下列函数振幅、周期和初相,并说明这些函数的图像可以由正弦曲线经过怎样的变换得到(1)y=3/4sin(1/5x-π/7) (2)y=8sin(4x+π/3)
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![不画图,写出下列函数振幅、周期和初相,并说明这些函数的图像可以由正弦曲线经过怎样的变换得到(1)y=3/4sin(1/5x-π/7) (2)y=8sin(4x+π/3)](/uploads/image/z/2797673-41-3.jpg?t=%E4%B8%8D%E7%94%BB%E5%9B%BE%2C%E5%86%99%E5%87%BA%E4%B8%8B%E5%88%97%E5%87%BD%E6%95%B0%E6%8C%AF%E5%B9%85%E3%80%81%E5%91%A8%E6%9C%9F%E5%92%8C%E5%88%9D%E7%9B%B8%2C%E5%B9%B6%E8%AF%B4%E6%98%8E%E8%BF%99%E4%BA%9B%E5%87%BD%E6%95%B0%E7%9A%84%E5%9B%BE%E5%83%8F%E5%8F%AF%E4%BB%A5%E7%94%B1%E6%AD%A3%E5%BC%A6%E6%9B%B2%E7%BA%BF%E7%BB%8F%E8%BF%87%E6%80%8E%E6%A0%B7%E7%9A%84%E5%8F%98%E6%8D%A2%E5%BE%97%E5%88%B0%281%29y%3D3%2F4sin%281%2F5x-%CF%80%2F7%29+++++%EF%BC%882%EF%BC%89y%3D8sin%EF%BC%884x%2B%CF%80%2F3%EF%BC%89)
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