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If I completed the "Trigonometry" under the "Math" category, do I still need to learn the first section of "Precalculus" which is also "trigonometry"?
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If I completed the "Trigonometry" under the "Math" category, do I still need to learn the first section of "Precalculus" which is also "trigonometry"? Are their contents the same or is there one th...