函數(shù)y=arccos(2x 1)值域為[pai/3,2/3pai]，則x的取值范圍

熱心網(wǎng)友

y=arccos(2x+1)值域為[pai/3,2/3pai]，則: 2x+1 = cosy = [-1/2,1/2]== X = [-3/4,-1/4]