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September 29th, 2018, 10:26 AM   #1
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fundamental subtraction question

I have:

sin(e-c)

c=e+a

now is it:

sin(e - e+a)

or

sin(e + -1*(e+a)) = sin(e - e -a)

it has to be the latter right?
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September 29th, 2018, 10:34 AM   #2
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Yes the last is correct, but you don't need the 1 multiplier.
Just use brackets.

Sin(e-c) where c = [e+a] is

Sin(e-[e+a]) = sin(e-e+a) = sin(a)
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September 30th, 2018, 12:16 PM   #3
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Oops I really don't deserve that thanks as I posted the wrong thing.
But it was a good job it came up since I can now apologise and correct my mistake.

Sin(e-[e+a]) = sin(e-e-a) = sin(-a)

Not Sin(e-[e+a]) = sin(e-e+a) = sin(a) as I originally wrote.


It is very important to realise that the minus sign before a bracket changes every sign in the bracket.
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September 30th, 2018, 03:44 PM   #4
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Quote:
Originally Posted by studiot View Post
Oops.....
Should be "whoops"!
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September 30th, 2018, 05:19 PM   #5
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Quote:
Originally Posted by Denis View Post
Should be "whoops"!
https://www.merriam-webster.com/dictionary/oops?show=0

https://www.merriam-webster.com/dictionary/whoops
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September 30th, 2018, 06:16 PM   #6
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It's still "whoops" out here !
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September 30th, 2018, 06:44 PM   #7
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Quote:
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It's still "whoops" out here !
Denis lives in the Canadian equivalent of West Virginia: it takes a while for linguistic innovations to percolate into the more distant hollows. They still use "thou," "thee," "thy," and "thine" out there.
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September 30th, 2018, 06:49 PM   #8
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...plus they drink "spots of tea"....
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September 30th, 2018, 06:52 PM   #9
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Quote:
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...plus they drink "spots of tea"....
Not among the whoopies (western PA slang for West Virginians): they drink white lightning and Mountain Dew, an almost lethal concoction.
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September 30th, 2018, 07:01 PM   #10
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Oh ya...google "caribou whiskey"....

or:

Caribou
noun
1.Canadian a mixed drink containing wine and grain alcohol
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Last edited by Denis; September 30th, 2018 at 07:05 PM.
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