cos(2x+3y)−xsin(2x+3y)(2+3
dx
dy
)=
dx
dy
sinx+ycosx
You asked:
Investigate the equation: \(\cos\left( 2 x + 3 y \right) - x \cdot \sin\left( 2 x + 3 y \right) \cdot \left(2 + 3 d x d y\right) = d x d y \cdot \sin\left( x \right) + y \cdot \cos\left( x \right)\).