Let sin A = - 5/13 with A in QIII and find the following. tan 2A
Added by Susan T.
Close
Step 1
We are given that $\sin A = -\frac{5}{13}$. We can use the Pythagorean identity $\sin^2 A + \cos^2 A = 1$ to find the cosine of A. $(-\frac{5}{13})^2 + \cos^2 A = 1$ $\frac{25}{169} + \cos^2 A = 1$ $\cos^2 A = 1 - \frac{25}{169}$ $\cos^2 A = Show more…
Show all steps
Your feedback will help us improve your experience
Supreeta N and 78 other Algebra and Trigonometry educators are ready to help you.
Ask a new question
Labs
Want to see this concept in action?
Explore this concept interactively to see how it behaves as you change inputs.
Key Concepts
Recommended Videos
Let $\sin A=-\frac{3}{5}$ with $A$ in QIII and find the following. $$\cos 2 A$$
Identities and Formulas
Double-Angle Formulas
Let sin A = -12/13 with A in QIII and find the following: sin 2A.
Hemraj K.
Recommended Textbooks
Introductory and Intermediate Algebra for College Students 4th
Prealgebra
Prealgebra and Introductory Algebra
Transcript
18,000,000+
Students on Numerade
Trusted by students at 8,000+ universities
Watch the video solution with this free unlock.
EMAIL
PASSWORD