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y=根3倍的sinx+cosx =根3倍根號2的sin(x+4分之派) 因為x屬於.0到2分之派 所以x+4分之派屬於4分之派到4分之3派 sin(x+4分之派)屬於2分之根號2到1 值域是根3到根3倍根號2
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