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The following.

Find real zeros. interval OLOL 2 1 f ( x ) = cos ( 2 x ) + sin x 2 which half angle formula should be used to find sing - 317 ) ? 8 3 which half angle formula should be used to find sin 75 . 4 tano = - 8 , sing LO Find, a) sin 20, cos 20 , sin J cos 0 , tan 20, tand 2 5 Seco = 1. , Find exact value of sec 1/ IT. which coso , 8 half angle formula should be used to find COS VITI ? 8 6 tand = = 4 , IT LX .