If \( a_{1} \) and \( a_{2} \) are two non-collinear unit vectors and if \( \left|a_{1}+a_{2}\ri...

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If \( a_{1} \) and \( a_{2} \) are two non-collinear unit vectors and if \( \left|a_{1}+a_{2}\right|=\sqrt{3} \), then the value of \( \left(a_{1}-a_{2}\right) \cdot\left(2 a_{1}+a_{2}\right) \) is
(a) math xmlns=http://www.w3.org/1998/Math/MathML class=wrs_chemistrymn2/mn/math
(b) \( \frac{3}{2} \)
(c) \( \frac{1}{2} \)
(d) math xmlns=http://www.w3.org/1998/Math/MathML class=wrs_chemistrymn1/mn/math
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