What is the first d/(dt)(cos(120pi)t) ?

The first d/(dt)(cos(120pi)t) is 1

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d/(dt)(cos(120pi)t)

\frac{d}{d t} (cos (120 π) t)

1

Solution steps

\frac{d}{d t} (cos (120 π) t)

Simplify

cos (120 π) t : t

= \frac{d t}{d t}

Apply the common derivative:

\frac{d t}{d t} = 1

= 1

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