I NEED THIS DONE ASAP OLEASE HELP ME$!$

$2$ of the answers are NOT correct.

Suppose $f(x,y)=\sqrt[\phantom{2}]{tan(x)+y}$ and $u$ is the unit vector in the direction of $($:$-3,-3$:$).$ Then,

$($a$)$ gradf$(x,y)=($:$\frac{se{c}^2(x)}{2\sqrt[\phantom{2}]{tan(x)}},1$:$)$

$($b$)$ gradf$(1\mathrm{.}2,6)=$

$($c$)f_u(1\mathrm{.}2,6)=D_{u}f(1\mathrm{.}2,6)=$

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