The value of the directional derivative of the function ๐›ท(๐‘ฅ, ๐‘ฆ, ๐‘ง) = ๐‘ฅ๐‘ฆ2 + ๐‘ฆ๐‘ง2 + ๐‘ง๐‘ฅ2

Q. The value of the directional derivative of the function ๐›ท(๐‘ฅ, ๐‘ฆ, ๐‘ง) = ๐‘ฅ๐‘ฆ2 + ๐‘ฆ๐‘ง2 + ๐‘ง๐‘ฅ2 at the point (2, -1, 1) in the direction of the vector ๐ฉ = ๐ข + 2๐ฃ + 2๐ค is

(A) 1ย ย ย ย ย ย ย ย ย ย ย ย ย ย ย ย ย ย ย ย ย ย ย ย ย ย  (B) 0.95ย ย ย ย ย ย ย ย ย ย ย ย ย ย ย ย ย ย ย ย ย  (C) 0.93ย ย ย ย ย ย ย ย ย ย ย ย ย ย ย ย ย ย ย ย ย  (D) 0.9

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