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18. cos C-cos D= 2sin, C+D, D-C, sin, 19. sin 24 = 2sin Acos A, 20. cos 24 cos A-sin A, 21. cos 2A = 2 cos A-1=1-2 sin² A=, 1- tan A, 1+ tan? A, 2 tan A, 22. sin 24 =, 1+ tan A, 23. tan 24 =, 2 tan A, 1- tan? A, cot A-1, 24. cot 24 =, 2 cot A, 25. sin 34 = 3 sin A-4 sin' A, |26. cos 3A = 4 cos'-3 cos A, 27, tan 34 =, 3 tan A- tan' A, 1-3 tan? A, 2 tan, 2., A, A, 28., sin A = 2 sin, .cos, 1+ tan?, A, 1- tan 4, 29 cos A = cos, in²=1-2 sin?, = 2 cos? A-1, A, sin?, 2, 1+ tan, A, 2 tan, tan A =, 30., A, 1- tan, 2, 32. 1+cos A = 2 cos?, 1+cos A, 34. sin A =, 1-cos 2A, 1-cos 2.4, 35. sin A =., 1+ cos 24, A, 37, cos, 1+cos A, 36. cot A =, %3D, sin 24, 1-cos A, 1+ tan x, 38, sin, 2 V, 39 tan, 1- tan x, 1+ tan, tan, 41., 1+ tan x, 1- tan, 2, MODERN SCIENCE COACHING, 1- tan, 42., 1, 43. sin' A = (3 sin A-3 sin 3A), 1+ tan, 2, 44. cos' A =, (cos 3A+3 cos A), MODERN SCIENCE COACHING, DIRECTOR:-SACHIN KUMAR