Give the exact value of each expression. See Example 5. sin 30°

검증된 단계별 안내

Recall the definition of the sine function in a right triangle: \(\sin \theta = \frac{\text{opposite side}}{\text{hypotenuse}}\).

Recognize that 30° is a special angle in trigonometry, often associated with well-known exact values.

Use the known exact value for \(\sin 30^\circ\), which comes from the properties of a 30°-60°-90° triangle.

Recall that in a 30°-60°-90° triangle, the side opposite 30° is half the length of the hypotenuse.

Therefore, \(\sin 30^\circ = \frac{1}{2}\).

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주요 개념

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Definition of the Sine Function

The sine of an angle in a right triangle is the ratio of the length of the side opposite the angle to the hypotenuse. It is a fundamental trigonometric function used to relate angles to side lengths.

Special Angles and Their Exact Values

Certain angles like 30°, 45°, and 60° have well-known exact sine values derived from special triangles. For example, sin 30° equals 1/2, which is often memorized or derived from an equilateral triangle split in half.

Using Reference Triangles to Find Exact Values

Reference triangles, such as the 30°-60°-90° triangle, help determine exact trigonometric values without a calculator. Understanding their side ratios allows for precise computation of sine, cosine, and tangent values.