Sin (x) = 5/13 in a right triangle. Find sin (x - 30). Cos(x) = 2/(2√5) for a right triangle. Find sin (2x). Cos(x) = 2/(2√5) for a right triangle. Find Tan (2x). Sin (x) = 5/13 in a right triangle. Find cos (x +45). Sin (x) = 5/13 in a right triangle. Find tan (x + 30). Cos (x) = 12/13 in a right triangle. Find sin (x +30). Cos (x) = 12/13 in a right triangle. Find cos (x - 30). Cos (x) = 12/13 in a right triangle. Find tan (x -30).