What is the derivative of f(x)=xcos(x) ?

The derivative of f(x)=xcos(x) is cos(x)-xsin(x)

What is the first derivative of f(x)=xcos(x) ?

The first derivative of f(x)=xcos(x) is cos(x)-xsin(x)

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derivative of

f (x) = x cos (x)

cos (x) - x sin (x)

Solution steps

\frac{d}{d x} (x cos (x))

Apply the Product Rule:

(f \cdot g)^{'} = f^{'} \cdot g + f \cdot g^{'}

f = x, g = cos (x)

= \frac{d x}{d x} cos (x) + \frac{d}{d x} (cos (x)) x

\frac{d x}{d x} = 1

\frac{d}{d x} (cos (x)) = - sin (x)

= 1 \cdot cos (x) + (- sin (x)) x

Simplify

= cos (x) - x sin (x)

What is the derivative of f(x)=xcos(x) ?
The derivative of f(x)=xcos(x) is cos(x)-xsin(x)
What is the first derivative of f(x)=xcos(x) ?
The first derivative of f(x)=xcos(x) is cos(x)-xsin(x)