What is the derivative of-3x^2cos(3x) ?

The derivative of-3x^2cos(3x) is -3(2xcos(3x)-3x^2sin(3x))

What is the first derivative of-3x^2cos(3x) ?

The first derivative of-3x^2cos(3x) is -3(2xcos(3x)-3x^2sin(3x))

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derivative of

- 3 x^{2} cos (3 x)

- 3 (2 x cos (3 x) - 3 x^{2} sin (3 x))

Solution steps

\frac{d}{d x} (- 3 x^{2} cos (3 x))

Take the constant out:

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

= - 3 \frac{d}{d x} (x^{2} cos (3 x))

Apply the Product Rule:

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

f = x^{2}, g = cos (3 x)

= - 3 (\frac{d}{d x} (x^{2}) cos (3 x) + \frac{d}{d x} (cos (3 x)) x^{2})

\frac{d}{d x} (x^{2}) = 2 x

\frac{d}{d x} (cos (3 x)) = - sin (3 x) \cdot 3

= - 3 (2 x cos (3 x) + (- sin (3 x) \cdot 3) x^{2})

Simplify

= - 3 (2 x cos (3 x) - 3 x^{2} sin (3 x))

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What is the derivative of-3x^2cos(3x) ?
The derivative of-3x^2cos(3x) is -3(2xcos(3x)-3x^2sin(3x))
What is the first derivative of-3x^2cos(3x) ?
The first derivative of-3x^2cos(3x) is -3(2xcos(3x)-3x^2sin(3x))