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7-78.

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

  1. sin()

  2. sin()

Draw a unit circle and locate  radians.

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

How many degrees is equivalent to  radians?

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

 or 0.707

Since  is equivalent to  of  is .

What is  of ? Locate   on the unit circle.

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