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Calculus Problem(Please help)?

發問:

Find the directional derivative of f(x,y,z) = yz + x^4 at the point (2,3,1) in the direction of a vector making an angle of 3pi/4 with gradf (2,3,1).Give an exact answer and step please. Thx so much for you help.

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As follows 圖片參考:http://i923.photobucket.com/albums/ad74/w_khs/hk_dir_deriv.jpg (http://i923.photobucket.com/albums/ad74/w_khs/hk_dir_deriv.jpg) 2012-04-01 09:56:59 補充: *Let u be an...

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