30. simplify VI -sin) + (1 - cose) ...
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30. simplify VI -sin) + (1 - cose) RRB NTPC (Phase I) 2016 (1) cote (2) tano (4) coseco (3) seco

11th - 12th Class
Maths
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30. (1) By Trigonometric identies ( 1-sin ^{2} theta=cos theta ) and ( 1-cos ^{2} theta=sin theta ) [ sqrt{frac{left(1-sin ^{2} thetaright)}{left(1-cos ^{2} thetaright)}}=sqrt{frac{cos ^{2} theta}{sin ^{2} theta}}=frac{cos theta}{sin theta} ] By reciprocal relation of Trigonometric ratios [ cot theta=frac{cos theta}{sin theta} ]
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