Determine whether the equation is exact. If it is, then solve it.
$$
\left[ 2y \cos(xy) + \frac{5}{\sqrt{1-x^2}} \right] dx + \left[ 2x \cos(xy) - 5y - \frac{1}{7} \right] dy = 0
$$
For the given equation, write out the condition for exactness.
$$
\frac{\partial}{\partial y} \left[ 2y \cos(xy) + \frac{5}{\sqrt{1-x^2}} \right] = \frac{\partial}{\partial x} \left[ 2x \cos(xy) - 5y - \frac{1}{7} \right]
$$
Select the correct choice below and, if necessary, fill in the answer box to complete your choice.
(Type expressions using x and y as the variables.)
A. The equation is exact because
$$
\frac{\partial M}{\partial y}(x,y) = \frac{\partial N}{\partial x}(x,y) = 2 \sin(xy)
$$
. An implicit solution in the form F(x,y) = C is
$$
2 \sin(xy) + 5 \arcsin(x) - \frac{5}{2}y^2 - \frac{1}{7}y = C
$$
, where C is an arbitrary constant.
B. The equation is not exact because
$$
\frac{\partial M}{\partial y}(x,y) = \boxed{} \neq \frac{\partial N}{\partial x}(x,y) = \boxed{}
$$
.