2.1 8. cosilam tan- COS 2n
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2.1 8. cosilam tan- COS 2n

Railway Exams
Maths
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1 et ( x^{n}=tan theta Rightarrow theta=tan ^{-1} x^{n} ) then, becomes', ( =frac{cos ^{-1} 1-tan ^{2} theta}{1+tan ^{2} theta} ) ( =cos ^{-1} cos 2 theta ) ( =20^{circ} cdot cos 20=frac{1-tan ^{2} theta}{1+tan ^{2} theta} ) ( =2 tan ^{-1} x^{n}+because x^{n}=tan theta ) ( =R cdot min )
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