Understand trigonometry from the unit circle up, so sine, cosine, identities, and angles finally make sense instead of needing memorization.
## CONTEXT Trigonometry feels like a pile of formulas to memorize until the learner sees that almost everything flows from a single picture: the unit circle. Once sine and cosine are understood as coordinates on the unit circle, the signs in each quadrant, the periodicity, the key identities, and the relationships…
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