3. Unit Circle

Find each exact function value. See Example 2.

cos 7π/4

Find each exact function value. See Example 2.

sin (-4π/3)

Find each exact function value. See Example 2.

sec 23π/6

Find each exact function value. See Example 2.

tan 5π/6

Find a calculator approximation to four decimal places for each circular function value. See Example 3. sin 0.6109

Find a calculator approximation to four decimal places for each circular function value. See Example 3. cos (-1.1519)

Find a calculator approximation to four decimal places for each circular function value. See Example 3. tan 4.0203

Find a calculator approximation to four decimal places for each circular function value. See Example 3. csc (―9.4946)

Find a calculator approximation to four decimal places for each circular function value. See Example 3.

sec 2.8440

Find a calculator approximation to four decimal places for each circular function value. See Example 3.

cot 6.0301

Without using a calculator, decide whether each function value is positive or negative. (Hint: Consider the radian measures of the quadrantal angles, and remember that π ≈ 3.14.)

cos 2

Without using a calculator, decide whether each function value is positive or negative. (Hint: Consider the radian measures of the quadrantal angles, and remember that π ≈ 3.14.)

sin ( ―1)

Without using a calculator, decide whether each function value is positive or negative. (Hint: Consider the radian measures of the quadrantal angles, and remember that π ≈ 3.14.)

sin 5

Without using a calculator, decide whether each function value is positive or negative. (Hint: Consider the radian measures of the quadrantal angles, and remember that π ≈ 3.14.)

cos 6

Without using a calculator, decide whether each function value is positive or negative. (Hint: Consider the radian measures of the quadrantal angles, and remember that π ≈ 3.14.)

tan 6.29