If \( \vec{a}=\frac{1}{\sqrt{10}}(3 \hat{\mathrm{i}}+\hat{\mathrm{k... VIDEO
If \( \vec{a}=\frac{1}{\sqrt{10}}(3 \hat{\mathrm{i}}+\hat{\mathrm{k}}) \) and \( \overrightarrow{\mathrm{b}}=\frac{1}{7}(2 \hat{\mathrm{i}}+3 \hat{\mathrm{j}}-6 \hat{\mathrm{k}}) \), then the
P value of \( (2 \overrightarrow{\mathrm{a}}-\overrightarrow{\mathrm{b}})[(\vec{a} \times \vec{b}) \times(\vec{a}+2 \vec{b})] \) is
(1) -3
(2) 5
(3) 3
(4) -5
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