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(4*cos(x)*sin(y))'The calculation above is a derivative of the function f (x)

(4*cos(x))'*sin(y)+4*cos(x)*(sin(y))'

((4)'*cos(x)+4*(cos(x))')*sin(y)+4*cos(x)*(sin(y))'

(0*cos(x)+4*(cos(x))')*sin(y)+4*cos(x)*(sin(y))'

(0*cos(x)+4*(-sin(x)))*sin(y)+4*cos(x)*(sin(y))'

4*cos(x)*(sin(y))'-4*sin(x)*sin(y)

4*cos(x)*0-4*sin(x)*sin(y)

-4*sin(x)*sin(y)

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