# Find derivative at 1 of this complicated function

1. Jul 23, 2008

### sa1

1. The problem statement, all variables and given/known data
find dy/dx at x=-1 .

2. Relevant equations
sin ysin pi*x/2 + 31/2/2(sec-12x) +2x(tan(ln(x+2)))=0

3. The attempt at a solution
There is coming a term ln(sin pi*x/2) during differentiation which will be a ln of a negative number. Sorry if the problem is too easy .I am just starting differentiation.

2. Jul 23, 2008

### Defennder

Re: Differentiation

Is that really $$\sin (y^\frac{sin \pi x}{2})$$?

3. Jul 23, 2008

### sa1

Re: Differentiation

no it is (sin y)sin (pi*x/2)