Use half-angle formulas to find sin(22.5). Use half-angle formulas to find cos(30). Use half-angle formulas to find tan(30). Given tan(A) = 2 and A is in Quadrant I, find sin(2A). 0 1 1/2 4/5 Given tan(A) = 2 and A is in Quadrant I, find cos(2A). 0 1 -3/5 -3 Given tan(A) = 2 and A is in Quadrant I, find tan(2A). -1/3 2/3 -4/3 -2/3 If angle A is 45 degrees and angle B is 60 degrees. Find sin(A)cos(B) (sin(105) + sin(345)) (sin(105) - sin(345)) (sin(345) + cos(105)) (sin(345) - cos(105)) If angle A is 45 degrees and angle B is 60 degrees. Find cos(A)sin(B) (sin(105) + sin(345)) (sin(105) - sin(345)) (sin(345) + cos(105)) (sin(345) - cos(105)) If angle A is 45 degrees and angle B is 60 degrees. Find sin(A)sin(B) (cos(345) + cos(105)) (cos(105) - cos(345)) (cos(345) - cos(105)) (cos(105) + cos(345)) If angle A is 45 degrees and angle B is 60 degrees. Find cos(A)cos(B) (cos(345) + cos(105)) (cos(105) - cos(345)) (cos(345) - cos(105)) (cos(105) + cos(345))