Cos(x) question! How would you call 'x'?

  • Thread starter mimzy
  • Start date
  • #1
6
0
So I have this integration to solve but I needed help and I just couldn't make up a term to call that 'x' ><!! the term that is inside the parenthesis!! I know I've learned it somewhere but I just can't remember and it's making me nuts! >A<

Also, what would you do in order to solve an equation that involves lets say sin(x)/cos(2x) [its just made up so I can explain myself a little better :D] and you need to combine both terms... but in order to combine them you gotta make a substitution for that 'x' term ><

thanks in advance :D
 

Answers and Replies

  • #2
133
2
Integration by Substitution? Let x = [tex] \theta [/tex]? The symbol [tex] \theta [/tex] is pronounced theta? No idea what you are talking about.

Just so you know, there is no simpler form to:

[tex]
\frac{sin(\theta)}{cos(2 \theta)}
[/tex]

IT DOES NOT EQUAL:
[tex]
tan(\frac{1}{2} \theta)
[/tex]

No idea if this helps, still have no clue what you are asking...
 
  • #3
6
0
im just wondering for the name of that theta since it wont always be the same thing on all equations... it changes depending on what u are asked for... like x, theta, pi and so on... just he generic name of that >< sorry if I wasn't clear enough
 
  • #4
133
2
A variable? There's no set word to describe whatever variable you insert inside of a trigonometric function. You just say that it is the parameter in terms of which the function is defined...?
 
  • #5
Hurkyl
Staff Emeritus
Science Advisor
Gold Member
14,950
19
This is a function application expression:
[tex]A(B)[/tex]
It is composed of two subexpressions:
  • The expression [itex]A[/itex], which should be of function type
  • The expression [itex]B[/itex], whose type should be contained in domain of [itex]A[/itex]
In such expressions, [itex]B[/itex] is sometimes called the "argument", such as in the sentence "[itex]B[/itex] is the argument passed into the function [itex]A[/itex]".
 
  • #6
Speaking as a programmer, given cos(x), x is the argument or parameter to the function cos(). It can be a literal, such as 20, a variable, or an expression.

Fred
 

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