# How do I start to differentiate this?Watch

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Thread starter 4 years ago
#1

Multiply out the bracket (put sin on both lines)? Or leave it as it is? I know I then have to use the quotient rule.
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4 years ago
#2
(Original post by Airess3)

Multiply out the bracket (put sin on both lines)? Or leave it as it is? I know I then have to use the quotient rule.
If you do the chain rule and quotient rule as you would normally then that should get you the right answer
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4 years ago
#3
(Original post by MathsNerd1)
If you do the chain rule and quotient rule as you would normally then that should get you the right answer
note that, simplified, what you have inside the brackets is:

i.e. , youd then have :

which is somewhat (i think) easier to differentiate....

EDITED
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Thread starter 4 years ago
#4
(Original post by Hasufel)
note that, simplified, what you have inside the brackets is:

i.e. , yopud have inside:

which is somewhat (i think) easier to differentiate....
Where does the 1 come from beside the sin and cos?
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4 years ago
#5
(Original post by Airess3)

Multiply out the bracket (put sin on both lines)? Or leave it as it is? I know I then have to use the quotient rule.
This is undergraduate o.O please tell me it is part of some insane thing I do not understand.
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4 years ago
#6
(Original post by Airess3)
Where does the 1 come from beside the sin and cos?
beg your pardon - the sign between is a minus!!

from the rule above:
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Thread starter 4 years ago
#7
(Original post by Jai Sandhu)
This is undergraduate o.O please tell me it is part of some insane thing I do not understand.
It is first year university level (first semester work).
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4 years ago
#8
(Original post by Airess3)

Multiply out the bracket (put sin on both lines)? Or leave it as it is? I know I then have to use the quotient rule.
I'm scared by your phrase "put sin on both lines". It's not true that .
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4 years ago
#9
(Original post by MathsNerd1)
If you do the chain rule and quotient rule as you would normally then that should get you the right answer
It might help, by the way, to know that . That's immediately amenable to the chain rule if you know .
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4 years ago
#10
(Original post by Airess3)

Multiply out the bracket (put sin on both lines)? Or leave it as it is? I know I then have to use the quotient rule.
(Original post by Smaug123)
I'm scared by your phrase "put sin on both lines". It's not true that .
In the nicest possible way, why are you studying maths at university if you think this?
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4 years ago
#11
(Original post by lizard54142)
In the nicest possible way, why are you studying maths at university if you think this?
Brain farts are a thing - I've asserted in the past that it wasn't blindingly obvious that there are arbitrarily large finite groups :P
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Thread starter 4 years ago
#12
(Original post by Hasufel)
from the rule above:
So that's the answer an the question is finished?
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4 years ago
#13
(Original post by Smaug123)
It might help, by the way, to know that . That's immediately amenable to the chain rule if you know .
b****g me! - didnt see that!
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Thread starter 4 years ago
#14
(Original post by lizard54142)
In the nicest possible way, why are you studying maths at university if you think this?
Maths isn't my degree, I'm just doing a side course in it.
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4 years ago
#15
(Original post by lizard54142)
In the nicest possible way, why are you studying maths at university if you think this?
There isn't a nice way to say that at all.
Everyone makes mistakes.
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4 years ago
#16
(Original post by Hasufel)
b****g me! - didnt see that!
Now I'm consumed with curiosity as to what the asterisked word is.
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Thread starter 4 years ago
#17
(Original post by Hasufel)
beg your pardon - the sign between is a minus!!

from the rule above:
What do I do now?
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4 years ago
#18
(Original post by Smaug123)
Now I'm consumed with curiosity as to what the asterisked word is.
ha! - lol - just realised i meant to type something that rhymed with "bug her" said quickly!!
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4 years ago
#19
Airees3 - ignore my post - follow smaug123s tip - thats a damn sight easier than mine! (my lack of insight has led me astray here, and i need a spanking, nurse....)
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4 years ago
#20
(Original post by Hasufel)
my lack of insight has led me astray here, and i need a spanking, nurse....)
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