为什么sin2x-根号3cos2x=2sin(2x-派/3)
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sin2x+cos2x=根号2sin(2x+四分之派)怎么求的
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sin2x+根号3cos2x 怎么样变成2sin(2x+π/3)
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怎样算Sin2X-2Sin^2X =Sin2X+COS2X-1
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你能帮帮他们吗
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Children these days ________ their parents too much. They should learn to look after themselves.
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甲同学将蔗糖细细研磨;乙同学将蔗糖溶于水,蔗糖不见了,得到的糖水变甜了.能证明蔗糖是由微观粒子构成的同学是______(填“甲”或“乙”).
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I turned to bookshops and libraries looking for information and found _______.
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The boy _____ is playing the piano is a friend of mine. [ ]
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