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The value of cos 9°-sin 9°, is

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5+54

5−52

−5−52

none of these

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detailed solution

Correct option is B

We have,cos⁡9∘−sin⁡9∘=cos⁡9∘−sin⁡9∘2=1−sin⁡18∘=1−5−14=5−52

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