Calculate the partial derivative ∂∂xcos(x2−y)\frac{\partial}{\partial x} \cos(x^2 - y)∂x∂cos(x2−y).
−2xsin(x2−y)-2x \sin(x^2 - y)−2xsin(x2−y)
2xsin(x2−y)2x \sin(x^2 - y)2xsin(x2−y)
−sin(2x)-\sin(2x)−sin(2x)
sin(x2−y)\sin(x^2 - y)sin(x2−y)