A rectangle also works: draw a rectangle, add a line between the bottom left and top right corners. Your x and (pi/2)-x are the angles in the bottom left corner. Both sides of the equation are length of the rectangle over the length of the diagonal.
@Nick.Earthloop started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
A rectangle also works: draw a rectangle, add a line between the bottom left and top right corners. Your x and (pi/2)-x are the angles in the bottom left corner. Both sides of the equation are length of the rectangle over the length of the diagonal.