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Core 3 differentitaion

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?
(edited 7 years ago)
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.
Reply 2
Avatar for Lychee628
Lychee628
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19
Original post by ghostwalker
Yes.


Use the chain rule to find the derivative of tan-1(x/a) 
Reply 3
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Lychee628
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19
Is the derviative of tan-1u , 1/(1+u^2)
Original post by Ayaz789
Is the derviative of tan-1u , 1/(1+u^2)


Yes.
Reply 5
Avatar for Lychee628
Lychee628
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19
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?
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".
Reply 7
Avatar for Lychee628
Lychee628
OP
19
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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