# derivative using table

• February 1st 2009, 08:33 PM
gabet16941
derivative using table
I know im supposed to change it so that it looks like one on the table but im stuck on how i should change it. Thank you

$int(1/(7+y^2))$
• February 1st 2009, 08:38 PM
topher0805
Quote:

Originally Posted by gabet16941
I know im supposed to change it so that it looks like one on the table but im stuck on how i should change it. Thank you

$int(1/(7+y^2))$

Do you mean this?

$\int \frac{1}{7+y^2}$

If so...this should be in your table:

$\int \frac{1}{a^2+x^2} = \frac {1}{a}\tan^{-1} {\left(\frac{x}{a}\right)} + C$

And just recognize that $a$ is equal to the square root of 7.
• February 1st 2009, 08:40 PM
gabet16941
yes sorry