"Columbia Graduate math teacher"
...In addition, from 1991-1993, I tutored a colleague discrete math and other college math subjects, she passed every subject that I tutored. I learned differential equations in the college. It was at a 4-credit scale. I fifnished it in one semester. My major was math education. I had learned two years of linear algebra for 4-credit per semester in...
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10+ subjects, including trigonometry