a) Use an Addition or Subtraction Formula to write the expression as a trigonometric fu sin cos 15. sin 15 - cosl Find its exact value. Submit Answer 6) Use an Addition or Subtraction Formula to write the expression as a trigonometric fu tan(79°) – tan(19°) 1 + tan(79°) tan(19°) - Find its exact value. Use an Addition or Subtraction Formula to write the expression as a trigonometric fu (-) 13n 13n cos 15 - sin sin cosl - 15 Find its exact value.

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