当您输入 y=acos(theta) 时，最后一个问题如何解决？实际 y，y=asin(theta)，那么 y 如何等于 acos(theta)？####[['y', 'Mathematical_Related_Concept', 'NEG'], ['acos(theta', 'Mathematical_Related_Concept', 'NEG'], ['y=acos(theta)', 'Mathematical_Related_Concept', 'NEG'], ['y=asin(theta)', 'Mathematical_Related_Concept', 'NEG']]