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# Core 3 differentitaion

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1. By writing cosecx =1 / sin xand using the quotient rule find the derivative of cosecx.

So ive got to -cosx/sin^2x which is -cotx/sinx which is -cotxcosecx is this right?
2. (Original post by Ayaz789)
By writing cosecx =1 / sin xand using the quotient rule find the derivative of cosecx.

So ive got to -cosx/sin^2x which is -cotx/sinx which is -cotxcosecx is this right?
Yes.
3. (Original post by ghostwalker)
Yes.
Use the chain rule to find the derivative of tan-1(x/a) 
4. Is the derviative of tan-1u , 1/(1+u^2)
5. (Original post by Ayaz789)
Is the derviative of tan-1u , 1/(1+u^2)
Yes.
6. (Original post by ghostwalker)
Yes.
For the above question the answer is a/a^2+x^2 and i got -a/a^2+x^2
Where have i got the minus sign from?
7. (Original post by Ayaz789)
For the above question the answer is a/a^2+x^2 and i got -a/a^2+x^2
Where have i got the minus sign from?
Post the question and your working. Your previous question didn't even mention "x", or "a".
8. (Original post by ghostwalker)
Post the question and your working. Your previous question didn't even mention "x", or "a".
Dw my exam is over

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