Trigonometric ratio of multiple and submultiple angles chapter | cos of multiple angle formula | 3

This lecture contains following questions on trigonometric ratio of multiple and submultiple angles formula prove that cos (2θ) = 2cos^2 (θ) - 1 or cos (θ) = 2cos^2 (θ/2) - 1 prove that cos (2A) = (1-tan^2 A)/(1+tan^2 A) or cos (A) = (1-tan^2 (A/2))/(1+tan^2 (A/2) prove that tan (2A) = (2tan (A))/(1- tan^2 (A)) or tan (A) = (2tan (A/2))/(1- tan^2 (A/2)) prove that sin 3A = 3 sin A - 4 sin^3 A prove that cos 3θ = 4 cos^3 θ - 3 cos θ prove that tan 3A = (3 tan A - tan^3 A)/(1 - 3 tan^2 A) sin of multiple angle formula cos of sub multiple angle formula cos of multiple angle formula tangent of multiple angle formula tan 2 theta formula proof proof of tan 2 theta formula sub-multiple angles trigonometric formulas sub-multiple angle trigonometry formulas trigonometry formula for sin of multiple angle trigonometric formula for sin of multiple angle trigonometry formula for sin of sub multiple angle trigonometric formula for sin of sub multiple angle trigonometric ratio of multiple and sub multiple angles trigonometric ratio of multiple and sub multiple angles formulas trigonometric ratio of multiple and sub multiple angles chapter trigonometric ratio of multiple and sub multiple angles diploma first semester trigonometric ratio of multiple and sub multiple angles first sem trigonometric ratio of multiple and sub multiple angles 1st sem