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$\cos {7.5}^{\circ} =$

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2+2+68

4+2+68

22+3+122

4+2+64

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detailed solution

Correct option is B

Let θ=7.5∘⇒2θ=15∘=45∘−30∘⇒cos⁡2θ=122(3+1)⇒2cos2⁡θ=122(3+1)+1⇒cos2⁡θ=3+1+222×22=6+2+48

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cos⁡7.5∘=

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$\cos {7.5}^{\circ} =$