Homework Statement
integral of x^2/sqrt(9-25x^2)
Homework Equations
The Attempt at a Solution
dont know how to type theta so I am using @
so i made x=3sin@
dx=3cos@d@...
thanks.
so: ddx arctan= 1/1+x^2
so i think i have to use substitution to get the answer.
so i can rewrite the equation as 1/1+(5x)^2
u= 5x
du= 5 dx
dx = du/5
then i would get 1/2 du / 1+u^2 which i could then make into 1/5arctan(u)
then the integrals would have to be changed x=0, u=0...
Homework Statement
integral of 1/1+25x^2 evaluated at sqrt.3/5 and 0/
Homework Equations
arctan=1/1+x^2
arcsing=1/(sqrt.(1-x^2))
lnx=1/x
The Attempt at a Solution
not sure if i have to use substitution or use lnx=1/x
this is what i tried, probably not right, integral...