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Q.

cos⁡7.5∘=

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a

2+2+68

b

4+2+68

c

22+3+122

d

4+2+64

answer is B.

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Detailed Solution

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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