## Capitalising trigonometric functions

I have always capitalised the first letter of my trigonometric functions, for example, writing Sinθ as opposed to the usual sinθ. Is it wrong to capitalise them? Does it make a difference in meaning?
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 Recognitions: Gold Member It does not, however that is not common practice.
 Recognitions: Homework Help It might make a difference, depending on your convention. Restricted sine and cosine functions sometimes have the first letter capitalised. Read: http://www.cliffsnotes.com/study_gui...eId-11639.html

## Capitalising trigonometric functions

I think I've heard that Sin(x) was used for a different definition of the sine function, like sin(some constant* x).

EDIT: after looking up on the internet, I haven't found anything supporting my claim yet, so I could be wrong.

Mentor
 Quote by Boorglar I think I've heard that Sin(x) was used for a different definition of the sine function, like sin(some constant* x).
In some texts, Sin(x) is the sine function restricted to its principal domain, [-##\pi/2, \pi/2##].

Similarly, Cos(x) is the cosine function restricted to its principal domain, [0, ##\pi##].

 Quote by Boorglar EDIT: after looking up on the internet, I haven't found anything supporting my claim yet, so I could be wrong.
 I've seen both Sin and Cos refer to the complex extensions of sin and cos. So it seems as if different authors use the capitalised forms for different variants.

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