Recent content by eaglesfn68

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...