What is the derivative of f(x)=sin(x)−cos(x)f(x) = \sin(x) - \cos(x)f(x)=sin(x)−cos(x)?
cos(x)+sin(x)\cos(x) + \sin(x)cos(x)+sin(x)
cos(x)−sin(x)\cos(x) - \sin(x)cos(x)−sin(x)
−cos(x)−sin(x)-\cos(x) - \sin(x)−cos(x)−sin(x)
1