# Integral and Derivative Help

1. Jan 14, 2010

### rmunoz

Integral and Derivative Help!!!

1. The problem statement, all variables and given/known data
I have 3 problems that i am struggling to solve for the simple fact that there are two variables in each problem. I have no experience with multivariable calculus... i feel like im missing something big because i have all the prerequisites for this physics course completed and with high grades yet this is our first hw... stuff we should be familiar with.
1. $$\int$$ 1/(d-x) dx

2. derivative of f(t)= sin($$\omega$$t -1)

3. $$\int$$ x/((x^2)+(L^2))^(3/2) dx

2. Relevant equations

3. The attempt at a solution
I've tried to solve 1 and 3 using trig substitution, partial fractions, integration by parts, u substitution but they all seem to lead to dead ends

2. Jan 14, 2010

### rock.freak667

Re: Integral and Derivative Help!!!

Assume 'd' and 'L' are constants. The first is a simple u-substitution. The second one, apply the chain rule.

3. Jan 14, 2010

### vela

Staff Emeritus
Re: Integral and Derivative Help!!!

The third one is a simple substitution as well. You could also do it with a trig substitution.