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(FORMULA SECTION-2, 2 Sin A cos B = Sin (A+8) + Sin (A-B), 2 CoS A Sin B = Sin (A+B)- Sin (A-8), 2 COSA COS B= COSCA +B) + COS (A-B), SinA Sin B 3 CoS CA-B)- CoS CA +B), Sinet sin D = 2 Sin C+D Cos, C-D, 2, 2, Sin e - sin D = 2 eas 0 sin 2, C+D, C-D, * Sin, 2, Cosc+ COSD = 2 COS, Cos C-D, 2., C+D, 2, etD sin DC $2-sin, cose - CoS D = 2 Sin, D-C, %3D, 2, 2, Sin 20 = 2 sin e Cos e, Cos 20 = Cos2e- sin20 = 20s2e-1 =1-2 sinte, %3D, tan 20 =, 2tan 0, 1- tan28, Cos 20 = 1-tan 20, 1+ tan20, 2tan 8, Sin 28 =, CoS 20 =, %3D, 6., 1+ tam20, ABHISEK SIR MATH