# Use the sum and difference formulas to find the exact value of cos(255 degrees)

Not what you're looking for?

Use the sum and difference formulas to find the exact value of cos(255 degrees)

Which of these is the correct answer?

A. (-√2 + √6)/4

B. (√2 - √6)/4

C. (√2 + √6)/4

D. (-√2 - √6)/4

[show your steps in completing this problem]

##### Purchase this Solution

##### Solution Summary

Sum and difference formulas are used to find the exact value of cos(255 degrees). The solution is detailed and well presented. The response received a rating of "5" from the student who originally posted the question.

##### Solution Preview

Hello and thank you for posting your question to Brainmass!

The solution is attached below (next to the paperclip ...

##### Purchase this Solution

##### Free BrainMass Quizzes

##### Probability Quiz

Some questions on probability

##### Solving quadratic inequalities

This quiz test you on how well you are familiar with solving quadratic inequalities.

##### Geometry - Real Life Application Problems

Understanding of how geometry applies to in real-world contexts

##### Graphs and Functions

This quiz helps you easily identify a function and test your understanding of ranges, domains , function inverses and transformations.

##### Multiplying Complex Numbers

This is a short quiz to check your understanding of multiplication of complex numbers in rectangular form.