Simplify sin (2arcsin (5/13))

We are asked to simplify the expression sin (2 arcsin (5/13)). The technique is to simplify first the inner terms inside the parenthesis. arc sin of 5/13 under the radians mode in the calculator is equal to 0.3948. This is multiplied by 2 equal to 0.7896. sin of 0.7896 is equal to 120/169.