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Dy/dx gives the derivative of y with respect to x.

In a standard curve y=f(x), dy/dx gives the slope of the curve at any point x.

In a standard curve y=f(x), dy/dx gives the slope of the curve at any point x.

for example:::d(sin x)/dx is equal to cos x.

but if we write d(sin y)/dx then it is equal to cos y dy/dx.