Hacker News
new
|
past
|
comments
|
ask
|
show
|
jobs
|
submit
login
contubernio
2 hours ago
|
parent
|
context
|
favorite
| on:
Why Mathematica does not simplify sinh(arccosh(x))
It's not a simplification, it's wrong. Sqrt(square(x))
equals
abs(x).
help
MForster
1 hour ago
[–]
It also equals x with appropriate assumptions (x > 0).
reply
notarget137
27 minutes ago
|
parent
|
next
[–]
Well, then sin(x) = x if x is infinitely small
reply
exe34
59 minutes ago
|
parent
|
prev
[–]
so there's an unconditionally correct answer (it's also equal to abs(x) for x>0), and then there is an answer that is only correct for half the domain, which requires an additional assumption.
reply
Guidelines
|
FAQ
|
Lists
|
API
|
Security
|
Legal
|
Apply to YC
|
Contact
Search:
