Question
Isaiah said that if the equation $\cos 2 x+2 \cos ^{2} x=2$ is divided by $2,$ an equivalent equationis $\cos x+\cos ^{2} x=1 .$ Do you agree with Isaiah? Explain why or why not.
Step 1
Isaiah suggests dividing the entire equation by 2 to get an equivalent equation. Show more…
Show all steps
Your feedback will help us improve your experience
Laura Skalaski and 57 other Geometry 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
Hannah said that if $\cos \theta=a,$ then $\sin \theta=\pm \sqrt{1-a^{2}} .$ Do you agree with Hannah? Explain why or why not.
TRIGONOMETRIC FUNCTIONS
Function Values of Special Angles
Given that $\sin 2 x=2 \sin x \cos x,$ deduce that $\cos 2 x=\cos ^{2} x-\sin ^{2} x$
Differentiation
Derivatives of Trigonometric Functions
Maggie said that $\cos (A+B)+\cos (A-B)=\cos 2 A .$ Do you agree with Maggie? Justify your answer.
TRIGONOMETRIC IDENTITIES
Cosine (A 1 B)
Transcript
18,000,000+
Students on Numerade
Trusted by students at 8,000+ universities
Watch the video solution with this free unlock.
EMAIL
PASSWORD