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# Solution: Find the derivative of the vector function ƒ(t)

#### Problem Statement: Electromagnetics

Electromagnetic/Vector Analysis Problem Solving

Find the derivative of the vector function ƒ(t) = tsinti + t^2j + tcos2t k at = π/4.

A. √2/2(1 + π/4)i + π/2 j – π/2 k

B. √2/2(1 – π/4)i – π/4 j + π/2 k

C. π/4 i – π/2 j + π/4 k

D. √2/2 πi – √2π/4 j – π/2 k

The derivative of the vector function ƒ(t) is equal to √2/2(1 + π/4)i + π/2 j – π/2 k.

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