Dear friends, Please read our latest blog post for an important announcement about the website. ❤, The Socratic Team

How do you simplify #cos(x+pi)#?

1 Answer
Write your answer here...
Start with a one sentence answer
Then teach the underlying concepts
Don't copy without citing sources
preview
?

Answer

Write a one sentence answer...

Answer:

Explanation

Explain in detail...

Explanation:

I want someone to double check my answer

Describe your changes (optional) 200

20
Aug 26, 2016

Answer:

See the Explanation.

Explanation:

We use the Formula #: cos(A+B)=cosAcosB-sinAsinB#

Letting, #A=, &, B=pi#, we get,

#cos(x+pi)=cosxcospi-sinxsinpi#

Since, #cospi=-1, and, sinpi=0#,

#cos(x+pi)=-cosx#.

Was this helpful? Let the contributor know!
1500
Impact of this question
7046 views around the world
You can reuse this answer
Creative Commons License