### Home > CCA2 > Chapter 7 > Lesson 7.1.5 > Problem 7-78

7-78.

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

sin(

) sin(

)

Draw a unit circle and locate

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

How many degrees is equivalent to

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

Since

What is

Draw a right triangle.

Notice that 60° is your reference angle.

Use the 30°-60°-90° relationship to find the exact value.