Posted by Liz on Sunday, October 7, 2012 at 10:26pm.
use the product rule.... x(siny) - y(cosx) = 1 x(cosy)dy/dx + siny - y(-sinx) - cosx(dy/dx) = 0 dy/dx(xcosy - cosx) = -siny - ysinx dy/dx = -(siny + ysinx)/(xcosy - cosx)