- #1

FallingMan

- 31

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## Homework Statement

Problem 1:

[PLAIN]http://img266.imageshack.us/img266/3852/problem1m.jpg [Broken]

Problem 2:

[PLAIN]http://img827.imageshack.us/img827/3862/problem3i.jpg [Broken]

**2. The attempt at a solution**

__Prob. 1:__

Well for this one I rewrote the integral first.

[tex]\int sec(x)(1-sin^2(x))dx[/tex]

Then I distributed the sec(x) term.

[tex]\int sec(x)-sec(x)sin^2(x)dx[/tex]

I'm stuck here :(

__Prob. 2:__

I think I'm supposed to use u-sub here.

Let [tex]u = \sqrt{x}[/tex]

[tex]du = \frac{1}{2\sqrt{x}}dx[/tex]

Then solve for [tex]dx = 2\sqrt{x}du[/tex]

Plug in for dx and you get:

[tex]\int (8x^2+2)(2\sqrt{x})(du)[/tex]

I'm really not sure if this is what's supposed to happen...

Thanks,

fm

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