Homework

Convert 5π/6 radians to degrees and find the sine and cosine values on the unit circle

First, we convert radians to degrees:

$$\text{Degrees} = \frac{5\pi}{6} \times \frac{180}{\pi} = \frac{5 \times 180}{6} = 150^{\circ}$$

Next, we identify the sine and cosine values for $150^{\circ}$ on the unit circle:

$$\sin(150^{\circ}) = \sin(180^{\circ} – 30^{\circ}) = \sin(30^{\circ}) = \frac{1}{2}$$

$$\cos(150^{\circ}) = \cos(180^{\circ} – 30^{\circ}) = -\cos(30^{\circ}) = -\frac{\sqrt{3}}{2}$$

Solve for the exact values of sine and cosine for the angle 7π/6 on the unit circle

First, note that $\frac{7\pi}{6}$ radians is in the third quadrant where both sine and cosine are negative. The reference angle for $\frac{7\pi}{6}$ is $\pi – \frac{7\pi}{6} = \frac{\pi}{6}$.

The sine and cosine values for $\frac{\pi}{6}$ are $\frac{1}{2}$ and $\frac{\sqrt{3}}{2}$, respectively. Since $\frac{7\pi}{6}$ is in the third quadrant, these values become negative.

Therefore, the exact values are:

$$\sin\left(\frac{7\pi}{6}\right) = -\frac{1}{2}$$

$$\cos\left(\frac{7\pi}{6}\right) = -\frac{\sqrt{3}}{2}$$

Find the sine and cosine of 135 degrees using the unit circle

$135^\circ$ is in the second quadrant. The reference angle is $180^\circ – 135^\circ = 45^\circ$.

The sine and cosine values for $45^\circ$ are $ \frac{1}{\sqrt{2}}$ and $\frac{1}{\sqrt{2}}$ respectively.

Since $135^\circ$ is in the second quadrant, the cosine value is negative and the sine value is positive.

Thus, $\cos 135^\circ = -\frac{1}{\sqrt{2}}$ and $\sin 135^\circ = \frac{1}{\sqrt{2}}$.

Find the coordinates of the point on the unit circle at an angle of \( \frac{\pi}{3} \) radians

To find the coordinates of the point on the unit circle at an angle of $ \frac{\pi}{3} $ radians, we use the formula for the coordinates on the unit circle: $ ( \cos \theta, \sin \theta ) $.

Here, $ \theta = \frac{\pi}{3} $.

So, we need to find $ \cos \frac{\pi}{3} $ and $ \sin \frac{\pi}{3} $.

From trigonometric values, we know that:

$$ \cos \frac{\pi}{3} = \frac{1}{2} $$

$$ \sin \frac{\pi}{3} = \frac{\sqrt{3}}{2} $$

Therefore, the coordinates of the point are $$ \left( \frac{1}{2}, \frac{\sqrt{3}}{2} \right) $$.

Find the cosine of an angle of \(\frac{\pi}{3}\) radians on the unit circle

To find the cosine of an angle of $\frac{\pi}{3}$ radians on the unit circle, we need to look at the coordinates of the point where the terminal side of the angle intersects the unit circle.

On the unit circle, the coordinates are given by $(\cos \theta, \sin \theta)$ where $\theta$ is the angle in radians.

For $\theta = \frac{\pi}{3}$, the coordinates are $(\frac{1}{2}, \frac{\sqrt{3}}{2})$.

Thus, the cosine of $\frac{\pi}{3}$ is $\frac{1}{2}$.

$$\cos \frac{\pi}{3} = \frac{1}{2}$$

Find the value of cos(θ) on the unit circle when θ = 60°

To solve for $\cos(60°)$, we can use the unit circle, where $\theta$ represents the angle from the positive x-axis.

On the unit circle, the coordinates of a point at an angle $\theta$ are $(\cos(\theta), \sin(\theta))$.

For $\theta = 60°$, the coordinates are $(\frac{1}{2}, \frac{\sqrt{3}}{2})$. Hence, $\cos(60°) = \frac{1}{2}$.

$$\cos(60°) = \frac{1}{2}$$

Find the cosine and sine values of an angle in the unit circle

Given an angle of \( \frac{5\pi}{4} \) radians, determine the cosine and sine values using the unit circle.

First, locate the angle \( \frac{5\pi}{4} \) on the unit circle. This angle is in the third quadrant where both sine and cosine values are negative.

The reference angle for \( \frac{5\pi}{4} \) is \( \frac{\pi}{4} \). In the unit circle, the sine and cosine of \( \frac{\pi}{4} \) are both \( \frac{\sqrt{2}}{2} \).

Since \( \frac{5\pi}{4} \) is in the third quadrant, the values become negative:

$$ \cos \left( \frac{5\pi}{4} \right) = -\frac{\sqrt{2}}{2} $$

$$ \sin \left( \frac{5\pi}{4} \right) = -\frac{\sqrt{2}}{2} $$

Find the cosecant of the angle π/6 on the unit circle

To find the cosecant of the angle $\frac{\pi}{6}$ on the unit circle, we first need to find the sine of $\frac{\pi}{6}$.

On the unit circle, the sine of $\frac{\pi}{6}$ is $\frac{1}{2}$.

The cosecant is the reciprocal of the sine.

So, the cosecant of $\frac{\pi}{6}$ is:

$$\csc\left(\frac{\pi}{6}\right) = \frac{1}{\sin\left(\frac{\pi}{6}\right)} = \frac{1}{\frac{1}{2}} = 2$$

Conversion Problem on the Unit Circle

$$\text{Given that } \theta = \frac{5\pi}{4} \text{ radians}, \text{ convert this angle to degrees and then determine the coordinates of the corresponding point on the unit circle.}$$

$$\text{To convert radians to degrees, use the formula:}$$

$$\theta_{deg} = \theta_{rad} \times \frac{180^{\circ}}{\pi}$$

$$\theta_{deg} = \frac{5\pi}{4} \times \frac{180^{\circ}}{\pi}$$

$$\theta_{deg} = 225^{\circ}$$

$$\text{Next, find the coordinates on the unit circle for } 225^{\circ}. \text{ This corresponds to the angle } 225^{\circ} \text{ or } \frac{5\pi}{4} \text{ radians.}$$

$$\cos(225^{\circ}) = \cos\left(\frac{5\pi}{4}\right) = -\frac{\sqrt{2}}{2}$$

$$\sin(225^{\circ}) = \sin\left(\frac{5\pi}{4}\right) = -\frac{\sqrt{2}}{2}$$

$$\text{Therefore, the coordinates are: } \left(-\frac{\sqrt{2}}{2}, -\frac{\sqrt{2}}{2}\right)$$