What is the d/(dθ)(cos(4θ)) ?

The d/(dθ)(cos(4θ)) is -sin(4θ)*4

What is the first d/(dθ)(cos(4θ)) ?

The first d/(dθ)(cos(4θ)) is -sin(4θ)*4

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\frac{d}{d θ} (cos (4 θ))

- sin (4 θ) \cdot 4

Solution steps

\frac{d}{d θ} (cos (4 θ))

Apply the chain rule:

- sin (4 θ) \frac{d}{d θ} (4 θ)

= - sin (4 θ) \frac{d}{d θ} (4 θ)

\frac{d}{d θ} (4 θ) = 4

= - sin (4 θ) \cdot 4

n = 0 \sum \infty (- 1)^{n} (x^{n})

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