Trigonometry — Sine, Cosine, Tangent, and Equations
Trigonometry studies how angles relate to side lengths. Sine, cosine, and tangent are the three primary ratios.
Trigonometry relates angles to side lengths. Right triangles use SOHCAHTOA; the unit circle extends those ratios to any angle.
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Should I use degrees or radians?
Most high-school geometry uses degrees. Calculus almost always uses radians. Match the mode to the course and the problem statement.