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.