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# differentiate root(2y)... watch

1. The answer is 1/root(2y) but i cant do it.
2. Wth?
3. (Original post by Simplicity)
Wth?
??
4. There are two ways to do this.

1. Write as and differentiate as usual

2. Use the chain rule, with

Note that the answer to #1 will actually give you , but since , it's equivalent. The answer to #2 gives it immediately in the form required.
5. Saying differentiate root 2y is ambigous.

Anyway,

Do you know the chain rule?
6. (Original post by nuodai)
There are two ways to do this.

1. Write as and differentiate as usual

2. Use the chain rule, with

Note that the answer to #1 will actually give you , but since , it's equivalent. The answer to #2 gives it immediately in the form required.
it days that i dont need to use the product rule, quotient or chain rule if i do the algebra first.

can you show me this method.
7. (Original post by Mr Kipling)
it days that i dont need to use the product rule, quotient or chain rule if i do the algebra first.

can you show me this method.
Do you mean the whole thing? Or can you use the result ?
8. (Original post by Mr Kipling)
it days that i dont need to use the product rule, quotient or chain rule if i do the algebra first.

can you show me this method.
I guess it would be this

then difference of squares.

But, that isn't easier.
9. (Original post by Mr Kipling)
it days that i dont need to use the product rule, quotient or chain rule if i do the algebra first.

can you show me this method.
That was nuodai's first method. (They were two separate methods.)

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