A community for students.
Here's the question you clicked on:
 0 viewing
anonymous
 one year ago
Hello, what method is being used to expand this expression?
anonymous
 one year ago
Hello, what method is being used to expand this expression?

This Question is Open

phi
 one year ago
Best ResponseYou've already chosen the best response.0they wrote 2a as a+a where a in this case is e^(x+y) similarly for 2 e^(xy) they then introduced e^(yx)  e^(yx) (which adds to zero) and similarly e^(xy)  e(xy)

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0I guess my real question is where did e^(yx)  e^(yx) and e^(xy)  e^(xy) come from or were they just added arbitrarily?

phi
 one year ago
Best ResponseYou've already chosen the best response.0I guess they are aiming to use Euler's formula https://en.wikipedia.org/wiki/List_of_trigonometric_identities#Relation_to_the_complex_exponential_function to write the expression in terms of sin and cos

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Except they're not complex functions. The first line simplifies to sinh (x+y), the hyperbolic sine. The second line is equivalent to the first line. What's the context? When extra terms are added that cancel each other, the purpose is usually to regroup the terms, in this case to get the sum of two or more groups of terms.
Ask your own question
Sign UpFind more explanations on OpenStudy
Your question is ready. Sign up for free to start getting answers.
spraguer
(Moderator)
5
→ View Detailed Profile
is replying to Can someone tell me what button the professor is hitting...
23
 Teamwork 19 Teammate
 Problem Solving 19 Hero
 Engagement 19 Mad Hatter
 You have blocked this person.
 ✔ You're a fan Checking fan status...
Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.