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यदि `cos 20^(@)-sin 20^(@)=p` हो, तो `cos 40^(@)` का मान होगा-A. `p^(2)sqrt(2-p^(2))`B. `psqrt(2-p^(2))`C. `p+sqrt(2-p^(2))`D. `p-sqrt(2-p^(2))`

Answer» Correct Answer - b


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