7 with A in QIII and find the following. 25 Let sin A = - sin 2A
Angles in Circles
Angles within a circle are feasible to create with the help of different properties of the circle such as radii, tangents, and chords. The radius is the distance from the center of the circle to the circumference of the circle. A tangent is a line made perpendicular to the radius through its endpoint placed on the circle as well as the line drawn at right angles to a tangent across the point of contact when the circle passes through the center of the circle. The chord is a line segment with its endpoints on the circle. A secant line or secant is the infinite extension of the chord.
Arcs in Circles
A circular arc is the arc of a circle formed by two distinct points. It is a section or segment of the circumference of a circle. A straight line passing through the center connecting the two distinct ends of the arc is termed a semi-circular arc.
6 please show work
![**Problem Statement:**
Given that \(\sin A = -\frac{7}{25}\) with \(A\) in Quadrant III (QIII), find the following:
**Task:**
\[ \sin 2A \]
**Solution Approach:**
To find \(\sin 2A\), we use the double angle identity for sine:
\[
\sin 2A = 2 \sin A \cos A
\]
Given that \(\sin A = -\frac{7}{25}\), we need to determine \(\cos A\). In Quadrant III, both sine and cosine are negative.
Using the Pythagorean identity:
\[
\sin^2 A + \cos^2 A = 1
\]
Substitute \(\sin A\):
\[
\left(-\frac{7}{25}\right)^2 + \cos^2 A = 1
\]
Calculate:
\[
\frac{49}{625} + \cos^2 A = 1
\]
\[
\cos^2 A = 1 - \frac{49}{625} = \frac{576}{625}
\]
Thus, \(\cos A = -\frac{24}{25}\) (negative in Quadrant III).
Now substitute back into the double angle identity:
\[
\sin 2A = 2 \times \left(-\frac{7}{25}\right) \times \left(-\frac{24}{25} \right)
\]
Calculate:
\[
\sin 2A = \frac{336}{625}
\]
So, \(\sin 2A = \frac{336}{625}\).](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fa3f5722f-10e6-440a-afee-0d2c295aa6c1%2F4b3a8f5f-b3fb-4dd6-ac45-d8333f8a025c%2Fa58p5l_processed.png&w=3840&q=75)

Trending now
This is a popular solution!
Step by step
Solved in 2 steps with 2 images







