C-09-Q173mediumsingle_mcq1−cos260∘1+cos260∘=?\dfrac{1 - \cos^2 60^\circ}{1 + \cos^2 60^\circ} = ?1+cos260∘1−cos260∘=?a35\dfrac{3}{5}53b53\dfrac{5}{3}ব্যাখ্যাWith cos260∘=14\cos^2 60^\circ=\tfrac14cos260∘=41, the expression equals .