It depends. Between 9th to 12th.
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there is an introat the end of grade ten but there is a real unit in grade eleven trigonometry is usaully taken during geometry and parts of pre/calculus. Its about 10th and/or 11th grade!
In Geometry, you learn about triangles. In Trigonometry you learn even more about triangles.
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Im pretty sure he flunked it
I was wondering if you knew but I think sophomore or junior. I was two grade levels ahead in math so I don't know for sure.