Use half angle formulas or formula for reducing powers to fill in the blanks in the identity below: (sin(7x))* = COS ( + cos(Use a half angle formula or formula for reducing powers to fill in the blanks in the identity below: (cos (8x))? = cos(\fIf sinr = , x in quadrant I, then find {without finding an : 3 mm =: mm: =: m) =: Using a double-angle or half-angle formula to simplify the given expressions. (a) If cos (31") - sin (31") = cos(A"), then A = degrees. (b) If cos (2x) - sin (2x) = cos( B), then B =Use a half angle or reduction formula to fill in the blanks in the identity below: (cos (6:))2- cos(16 If tamEx) = E {in QuadrantI], find mam: (Please enter answer accurate to 4 decimal:I places. )