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문제 1
Match each trigonometric function in Column I with its value in Column II. Choices may be used once, more than once, or not at all.
sin 30°
문제 3
CONCEPT PREVIEW Match each trigonometric function in Column I with its value in Column II. Choices may be used once, more than once, or not at all.
tan 45°
문제 5
CONCEPT PREVIEW Match each trigonometric function in Column I with its value in Column II. Choices may be used once, more than once, or not at all.
csc 60°
문제 6
Match each trigonometric function in Column I with its value in Column II. Choices may be used once, more than once, or not at all.
cot 30°
문제 7
Find exact values or expressions for sin A, cos A, and tan A. See Example 1.
문제 9
Find exact values or expressions for sin A, cos A, and tan A. See Example 1.
문제 11
Suppose ABC is a right triangle with sides of lengths a, b, and c and right angle at C. Use the Pythagorean theorem to find the unknown side length. Then find exact values of the six trigonometric functions for angle B. Rationalize denominators when applicable. See Example 1.
a = 5, b = 12
문제 13
Suppose ABC is a right triangle with sides of lengths a, b, and c and right angle at C. Use the Pythagorean theorem to find the unknown side length. Then find exact values of the six trigonometric functions for angle B. Rationalize denominators when applicable. See Example 1. a = 6, c = 7
문제 16
Suppose ABC is a right triangle with sides of lengths a, b, and c and right angle at C. Use the Pythagorean theorem to find the unknown side length. Then find exact values of the six trigonometric functions for angle B. Rationalize denominators when applicable. See Example 1. b = 8, c = 11
문제 18
Suppose ABC is a right triangle with sides of lengths a, b, and c and right angle at C. Use the Pythagorean theorem to find the unknown side length. Then find exact values of the six trigonometric functions for angle B. Rationalize denominators when applicable. See Example 1. a = √2, c = 2
문제 22
Write each function in terms of its cofunction. Assume all angles involved are acute angles. See Example 2. sin 45°
문제 26
Write each function in terms of its cofunction. Assume all angles involved are acute angles. See Example 2. tan 25.4°
문제 28
Write each function in terms of its cofunction. Assume all angles involved are acute angles. See Example 2. cos(θ + 20°)
문제 31
Find one solution for each equation. Assume all angles involved are acute angles. See Example 3. tan α = cot(α + 10°)
문제 33
Find one solution for each equation. Assume all angles involved are acute angles. See Example 3. sin(2θ + 10°) = cos(3θ - 20°)
문제 36
Find one solution for each equation. Assume all angles involved are acute angles. See Example 3. cot(5θ + 2°) = tan(2θ + 4°)
문제 38
Find one solution for each equation. Assume all angles involved are acute angles. See Example 3. cos(2θ + 50°) = sin(2θ - 20°)
문제 39
Find one solution for each equation. Assume all angles involved are acute angles. See Example 3. sec(3β + 10°) = csc(β + 8°)
문제 40
Find one solution for each equation. Assume all angles involved are acute angles. See Example 3. csc(β + 40°) = sec(β - 20°)
문제 42
Determine whether each statement is true or false. See Example 4. tan 28° ≤ tan 40°
문제 44
Determine whether each statement is true or false. See Example 4. cos 28° < sin 28° (Hint: sin 28° = cos 62°)
문제 46
Determine whether each statement is true or false. See Example 4. cot 30° < tan 40°
문제 48
Determine whether each statement is true or false. See Example 4. csc 20° < csc 30°
문제 49
Give the exact value of each expression. See Example 5. tan 30°
문제 51
Give the exact value of each expression. See Example 5. sin 30°
문제 52
Give the exact value of each expression. See Example 5. cos 30°
문제 56
Give the exact value of each expression. See Example 5. sec 45°
문제 58
Give the exact value of each expression. See Example 5. cot 45°
문제 64
Give the exact value of each expression. See Example 5. csc 60°
문제 67
Concept Check Work each problem. Find the equation of the line that passes through the origin and makes a 30° angle with the x-axis.
