You are reading a single comment by @gbj_tester and its replies.
Click here to read the full conversation.
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.
@gbj_tester
I think it's easy to explain if you draw it, with the hypotenuse as the radius of circle centred on x=y=0, you can then see how (π/2)-θ relates to θ making it obvious why the sin of the one is equal to the cos of the other.