In Exercises 1–26, find the exact value of each expression. _ cot⁻¹ (−√3)

검증된 단계별 안내

Recall that \( \cot^{-1}(x) \) represents the angle \( \theta \) whose cotangent is \( x \), i.e., \( \cot \theta = x \).

Set \( \theta = \cot^{-1}(-\sqrt{3}) \), so \( \cot \theta = -\sqrt{3} \).

Remember that \( \cot \theta = \frac{\cos \theta}{\sin \theta} \), so we are looking for an angle \( \theta \) where the ratio of cosine to sine is \( -\sqrt{3} \).

Identify the reference angle where \( \cot \theta = \sqrt{3} \), which corresponds to \( \theta = \frac{\pi}{6} \) (or 30 degrees), then determine the quadrant where cotangent is negative to find the correct angle for \( -\sqrt{3} \).

Express the final answer as \( \theta = \cot^{-1}(-\sqrt{3}) \) in terms of \( \pi \) using the principal value range of \( \cot^{-1} \), which is typically \( (0, \pi) \).

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주요 개념

질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.

Inverse Cotangent Function (cot⁻¹)

The inverse cotangent function, cot⁻¹(x), returns the angle whose cotangent is x. It is the inverse of the cotangent function, which relates an angle to the ratio of the adjacent side over the opposite side in a right triangle. Understanding its range and output values is essential for finding exact angle measures.

Cotangent and Its Relationship to Tangent

Cotangent is the reciprocal of tangent, defined as cot(θ) = 1/tan(θ) = adjacent/opposite. Recognizing this relationship helps convert cotangent values into tangent or sine and cosine values, facilitating the identification of angles corresponding to given cotangent values.

Exact Values of Special Angles

Certain angles, such as 30°, 45°, and 60° (or π/6, π/4, π/3 radians), have well-known exact trigonometric values involving √2 and √3. Knowing these exact values allows for precise evaluation of inverse trigonometric expressions without approximations.