Given expression:
\[
(4y \cos(xy) + \frac{7}{\sqrt{1 - x^2}}) \, dx
\]
Since there is no \( dy \) term given, the equation is incomplete as stated. Usually, an exact equation is given in the form:
\[
M(x,y) \, dx + N(x,y) \, dy = 0
\]
Assuming the problem
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