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受欢迎的微积分 >

d/(dt)(2cos(t))

解答

\frac{d}{d t} (2 cos (t))

解答

- 2 sin (t)

求解步骤

\frac{d}{d t} (2 cos (t))

将常数提出:

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

= 2 \frac{d}{d t} (cos (t))

使用常见微分定则:

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

= 2 (- sin (t))

化简

= - 2 sin (t)

作图

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