帮忙化简方程,实在化简不出来了x=r·cosα-vt·sinαy=r·sinα+vt·cosα-1/2g·t^2x^2+y^2=r^2结果是√(grsinα) ·gcosα ·t^3=g^2·t^4/4请问是怎么化简过来的.
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