19. If 13 sin(20) = 1 + cos(20) the...
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19. If 13 sin(20) = 1 + cos(20) then value of 0 will be : (1) 30° (2) 60° (3) 90° (4) 120°

IIT/JEE
Maths
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( sqrt{3}left(frac{2}{5} sin theta cdot cos thetaright)=2 cos ^{2} theta ) ( u_{0}^{prime} cos 2 theta=2 cos ^{2} theta-1 ) ( therefore sqrt{3} sin theta=cos theta ) ( tan theta=frac{1}{sqrt{3}} Rightarrow theta=30^{circ} )
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