Transformation of Trigonometric Functions a Case 3 [ tan x sec"x dx or f cotmix csex dx Where n is a positive integer sec2 x = 1+ tan2x csc2 x = 1 + cot2 xTransformation of Trigonometric Functions e Cuse 4 sin" x cos" x dx Where both m and a are positive even integers 1 sin x = = (1 - cos 2x) cos x = = (1 + cos 2x) 1 sin x cos x = = sin 2xTransformation of Trigonometric Functions . Case 2 [ tanox dx or ] cot"x dx Where n is an integer tan2x = sec2x - 1 cot2 x = csc2x - 1Transformation of Trigonometric Functions o Case 1 sin" x cosOx dx Where either m or n is a positive odd integer cos x = 1 - sin x