# Use an Addition or Subtraction Formula to find the exact value of the expression, as demonstrated in

Use an Addition or Subtraction Formula to find the exact value of the expression, as demonstrated in Example 1. tan 15 degree Use an Addition or Subtraction Formula to write the expression as a trigonometric function of one number. cos 10 degree cos 80 degree – sin 10 degree sin 80 degree Find its exact value. Use an appropriate Half-Angle Formula to find the exact value of the expression, cos 165 degree Solve the given equation. (Enter your answers as a comma-separated list. Let k be any integer. Round terms to two decimal places where appropriate.) sin theta = 1/2 Solve the given equation. (

Use an Addition or Subtraction Formula to find the exact value of the expression, as demonstrated in Example 1. tan 15 degree Use an Addition or Subtraction Formula to write the expression as a trigonometric function of one number. cos 10 degree cos 80 degree – sin 10 degree sin 80 degree Find its exact value. Use an appropriate Half-Angle Formula to find the exact value of the expression, cos 165 degree Solve the given equation. (Enter your answers as a comma-separated list. Let k be any integer. Round terms to two decimal places where appropriate.) sin theta = 1/2 Solve the given equation. (Enter your answers as a comma-separated list. Let k be any Integer. Round terms to two decimal places where appropriate.) cos theta + 1 = 0

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