# Integral calc questions

## Main Question or Discussion Point

Hi, im studying for my integral exam in 2 weeks,andim trying really hard to understand a few calc questions which i really cant get how to solve,
e.g
(ALL these questions are integrations questions)
1)ln^n(x)
i tried to put 1.ln^n (X) but i cant seem to get the answer right
^^^^ this is a derivation

2) same with tan^n (x)

i dont know how to integrate sec^(any even or odd power) x

x/(a+bx )1/2. how is this equal to 2/3b^2(bx-2a)(a+bx)^1/2
how do i derive tan^n(x)

Sinx/sin(x+alpha)

tiny-tim
Homework Helper
welcome to pf!

hi avleen! welcome to pf!

(have a square-root: √ and try using the X2 icon just above the Reply box )

you need to use the https://www.physicsforums.com/library.php?do=view_item&itemid=353"

you know how to differentiate xn, so to differentiate (tanx)n you put tanx = u …

ok, now you try it, and we'll see where you're going wrong
x/(a+bx )1/2. how is this equal to 2/3b^2(bx-2a)(a+bx)^1/2
are you sure? that doesn't look right

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