Find the exact value of each real number y if it exists. Do not use a calculator.
y = arcsin (―√3/2)

검증된 단계별 안내

Recall that the function \(\arcsin(x)\) gives the angle \(y\) in the interval \([-\frac{\pi}{2}, \frac{\pi}{2}]\) such that \(\sin(y) = x\).

Identify the value inside the arcsin function: \(x = -\frac{\sqrt{3}}{2}\). We need to find an angle \(y\) where \(\sin(y) = -\frac{\sqrt{3}}{2}\).

Recall the common sine values: \(\sin\left(\frac{\pi}{3}\right) = \frac{\sqrt{3}}{2}\). Since the sine is negative, the angle must be in the fourth or third quadrant, but \(\arcsin\) only returns values in \([-\frac{\pi}{2}, \frac{\pi}{2}]\) (first and fourth quadrants).

Since \(\sin(y) = -\frac{\sqrt{3}}{2}\) and \(y\) is in \([-\frac{\pi}{2}, 0]\) (fourth quadrant), the angle is \(y = -\frac{\pi}{3}\).

Therefore, the exact value of \(y\) satisfying \(y = \arcsin\left(-\frac{\sqrt{3}}{2}\right)\) is \(y = -\frac{\pi}{3}\).

비슷한 문제에 대한 검증된 영상 답변:

이 영상 해법은 위 문제에 도움이 된다고 튜터들이 추천한 것입니다.

도움이 되었나요?

주요 개념

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

Definition of arcsin (Inverse Sine Function)

The arcsin function is the inverse of the sine function, returning the angle whose sine is a given number. Its output range is limited to [-π/2, π/2], meaning it only returns angles in the first and fourth quadrants. Understanding this range is crucial for finding the correct angle corresponding to a sine value.

Exact Values of Sine for Special Angles

Certain angles have well-known sine values, such as π/6, π/4, and π/3. For example, sin(π/3) = √3/2. Recognizing these exact values helps in determining the angle when given a sine value like -√3/2, by considering the sign and the reference angle.

Sign and Quadrant Considerations for Inverse Trigonometric Functions

Since arcsin outputs angles only between -π/2 and π/2, negative sine values correspond to angles in the fourth quadrant (negative angles). For y = arcsin(-√3/2), the angle is negative and matches the reference angle π/3, resulting in y = -π/3.

Find the exact value of each real number y if it exists. Do not use a calculator.y = arcsin (―√3/2)