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After all that work, I am wrong. This is sad. Here I am thinking that learning is taking place when maybe precalculus is not sinking into my head. Perhaps, I am in over my head with this course and textbook. I probably should go back to Algebra 1 and start from there. If not that far back, perhaps Algebra 2.

See link below.

Multiple-Angle Equation...3

[QUOTE="nycmathguy, post: 1099629, member: 279"] After all that work, I am wrong. This is sad. Here I am thinking that learning is taking place when maybe precalculus is not sinking into my head. Perhaps, I am in over my head with this course and textbook. I probably should go back to Algebra 1 and start from there. If not that far back, perhaps Algebra 2. See link below. [SIZE=4][B][URL='https://www.math-forums.com/threads/multiple-angle-equation-3.441876/']Multiple-Angle Equation...3[/URL][/B][/SIZE] [/QUOTE]