What is the derivative of 4xcos(x) ?

The derivative of 4xcos(x) is 4(cos(x)-xsin(x))

What is the first derivative of 4xcos(x) ?

The first derivative of 4xcos(x) is 4(cos(x)-xsin(x))

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\frac{d}{d x} (4 x cos (x))

4 (cos (x) - x sin (x))

Solution steps

\frac{d}{d x} (4 x cos (x))

Take the constant out:

(a \cdot f)^{'} = a \cdot f^{'}

= 4 \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)

= 4 (\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)

= 4 (1 \cdot cos (x) + (- sin (x)) x)

Simplify

= 4 (cos (x) - x sin (x))

What is the derivative of 4xcos(x) ?
The derivative of 4xcos(x) is 4(cos(x)-xsin(x))
What is the first derivative of 4xcos(x) ?
The first derivative of 4xcos(x) is 4(cos(x)-xsin(x))