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9-66.
  1. Calculate each of the following values. Express your answers both exactly and as decimal approximations. Homework Help ✎

    1. sin

    2. sin

Remember that a full circle has 2π radians and a half circle has π radians.

Draw a right triangle and use the special triangle relationship to find the exact value.

Draw a right triangle.
Notice that 60° is your reference angle.
Use the 30°-60°-90° relationship to find the exact value.