Let and . Find…

MATHEMATICS · Single correct · CBSE · Mathematics · Vector Algebra · Vector Algebra

Problem

Let a⃗=(cos⁡30∘,sin⁡30∘)\vec{a}=(\cos30^{\circ},\sin30^{\circ}) and b⃗=(cos⁡75∘,sin⁡75∘)\vec{b}=(\cos75^{\circ},\sin75^{\circ}). Find a⃗ ⋅ b⃗\vec{a}\,\cdot\,\vec{b}. (a) cos⁡60∘\cos60^{\circ} (b) cos⁡105∘\cos105^{\circ} (c) cos⁡45∘\cos45^{\circ} (d) cos⁡15∘\cos15^{\circ}

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