Immanuel G.

asked • 03/24/18

proving the sum and difference equation for cosine

Suppose that 𝒗 and 𝒘 are unit vectors. If the angle between 𝒗 and 𝒊̂ is 𝛼 and that between 𝒘 and 𝒊̂ is 𝛽, prove that cos(𝛼−𝛽)=cos𝛼cos𝛽+sin𝛼sin𝛽

1 Expert Answer

By:

Jeffrey K. answered • 10/02/20

Tutor
New to Wyzant

Together, we build an iron base in mathematics and physics

Still looking for help? Get the right answer, fast.

Ask a question for free

Get a free answer to a quick problem.
Most questions answered within 4 hours.

OR

Find an Online Tutor Now

Choose an expert and meet online. No packages or subscriptions, pay only for the time you need.