- #1

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sin x + cos y = 5,

would one show this by writing:

d/dx(sin x + cos y = 5)

= and then differentiate with respect to x? I wasnt sure whether or not the bracket goes around the whole thing or just the left hand side.

Thanks

- Thread starter nokia8650
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- #1

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sin x + cos y = 5,

would one show this by writing:

d/dx(sin x + cos y = 5)

= and then differentiate with respect to x? I wasnt sure whether or not the bracket goes around the whole thing or just the left hand side.

Thanks

- #2

tiny-tim

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Hi nokia8650!

sin x + cos y = 5,

would one show this by writing:

d/dx(sin x + cos y = 5)

= and then differentiate with respect to x? I wasnt sure whether or not the bracket goes around the whole thing or just the left hand side.

Thanks

- #3

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Hmm, I never thought about that. Now I'll know it's correct

However, I use this notation

[tex]\sin{x}+\cos{y}=5\mid\cdot{d/dx}[/tex]

it's just seems more convenient

That's exactly the same thing isn't it?

I know it's a REALLY silly question but I just wanted to make sure

However, I use this notation

[tex]\sin{x}+\cos{y}=5\mid\cdot{d/dx}[/tex]

it's just seems more convenient

That's exactly the same thing isn't it?

I know it's a REALLY silly question but I just wanted to make sure

Last edited:

- #4

tiny-tim

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Hi armis![tex]\sin{x}+\cos{y}=5\mid\cdot{d/dx}[/tex]

(are you the same person as

I don't really understand that.

Can you show how the next couple of lines would go, so that we can see it in actual use?

- #5

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Nop, I am not the same person :)

Sure

[tex]\sin{x}+\cos{y}=5\mid\cdot{d/dx}[/tex]

We get

[tex]\cos{x}=0[/tex] if y is not a function of x

Most of our lecturers do that so I was wondering why bother writting ()

- #6

tiny-tim

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It looks weird to me …

but if your lecturers do it, I

I think writing the () is better because it avoids any possibility of ambiguity …

also, that vertical stroke may be clear on a whiteboard, where the lecturer can make it really large, but it's not so clear on paper or in a book.

- #7

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I am just so used to it that I could hardly think of writting () :)

But yeah, () avoids any possibility of ambiguity (phew.... that was a hard one for me, I am not an english speaker)

Indeed the vertical stroke is larger than the one I showed as I couldn't find one large enough in the LaTeX

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