The least value of \( \cos ^{2} \theta-6 \sin \theta \cdot \cos \theta+3 \sin ^{2} \theta+2 \) i...

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The least value of \( \cos ^{2} \theta-6 \sin \theta \cdot \cos \theta+3 \sin ^{2} \theta+2 \) is
(a) \( 4+\sqrt{10} \)
(b) \( 4-\sqrt{10} \)
(c) 0
(d) none of these
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