The value Daf of f (r, y, ) = e" cos y+el sin : at the point P(2, 1,0) where a is a unit vector in the direction PP where P'(-1,2, 2) is b.- sml d. – e cos 1- 2e² sin 1+2e sinl + a. – 3e? cos 1 - e2 sin 1+ 2e sin 1 C.-

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