No, the vector $(\hat{i}+\hat{j})$ is not a unit vector because its magnitude is,

\[|\hat{i}+\hat{j}|=\sqrt{|i|^2+|j|^2+2|i||j|\cos90°}\] \[=\sqrt{1^2+1^2+0}=\sqrt{2}\]

Since its magnitude is equal to $\sqrt{2}$ not $1$, it is not a unit vector.

No, the vector $(\hat{i}+\hat{j})$ is not a unit vector because its magnitude is,

\[|\hat{i}+\hat{j}|=\sqrt{|i|^2+|j|^2+2|i||j|\cos90°}\] \[=\sqrt{1^2+1^2+0}=\sqrt{2}\]

Since its magnitude is equal to $\sqrt{2}$ not $1$, it is not a unit vector.

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