Grade 12 advanced functions

See attached questions and answers below from my grade 12 advanced functions text which includes trigonometry. I understand the question and answer. For future problems, I know that it’s a good idea to break down given angles, i.e., cos (15) into the “remarkable” or “known” angles that are associated with a triangle and then apply the compound angle formulas.Provide a list of the remarkable (or most often used in grade 12 Trig) angles please Give the angle values in degrees and radians. I searched google but too many hits came up! Provide the name of the triangle the angles are from

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