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It's matrices and did you take the SAT II?
partially true, mostly false. at least in my school, matricies were taught in algebra 2, which for me was 10th grade, and trig was taught at the end of pre calc during 11th grade. i know the equation could be solved another way, but i couldnt think of it and all i came up with was a matrix that i couldnt do because i sucked at them.